Replace Newtonsoft.Json with System.Text.Json 10.x

- Remove vendored Newtonsoft.Json (entire src/Exceptionless/Newtonsoft.Json/ directory)
- Remove update-json.ps1 script
- Add System.Text.Json 10.0.0 NuGet package reference
- Rewrite DefaultJsonSerializer using System.Text.Json with:
  - SnakeCaseNamingPolicy matching legacy Newtonsoft behavior (e.g. OSName -> o_s_name)
  - Per-type snake_case applied only to Exceptionless.Models namespace
  - DataDictionaryConverter for storing complex values as JSON strings
  - SettingsDictionaryConverter for ObservableDictionary-based type
  - ObjectToInferredTypesConverter for proper type inference
  - PostDataConverter to convert object/array PostData to indented strings
  - Custom WriteValue with depth limiting and property exclusion support
- Update all model classes to remove [JsonObject] attributes
- Add [JsonPropertyName] for EnvironmentInfo OS properties
- Update DefaultSubmissionClient to use JsonDocument instead of JObject
- All 300 tests pass

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: niemyjski

src/Exceptionless/EventBuilder.cs

@@ -115,7 +115,7 @@ public EventBuilder AddTags(params string[] tags) {
 
         /// <summary>
         /// Sets an extended property value to include with the event. Use either <paramref name="excludedPropertyNames" /> or
-        /// <see cref="Exceptionless.Json.ExceptionlessIgnoreAttribute" /> to exclude data from being included in the event report.
+        /// <see cref="System.Text.Json.Serialization.JsonIgnoreAttribute" /> to exclude data from being included in the event report.
         /// </summary>
         /// <param name="name">The name of the object to add.</param>
         /// <param name="value">The data object to add.</param>
@@ -131,7 +131,7 @@ public EventBuilder SetProperty(string name, object value, int? maxDepth = null,
 
         /// <summary>
         /// Adds the object to extended data. Use either <paramref name="excludedPropertyNames" /> or
-        /// <see cref="Exceptionless.Json.ExceptionlessIgnoreAttribute" /> to exclude data from being included in the event.
+        /// <see cref="System.Text.Json.Serialization.JsonIgnoreAttribute" /> to exclude data from being included in the event.
         /// </summary>
         /// <param name="data">The data object to add.</param>
         /// <param name="name">The name of the object to add.</param>

src/Exceptionless/Exceptionless.csproj

@@ -23,30 +23,18 @@
     <None Include="readme.txt" pack="true" PackagePath="." />
   </ItemGroup>
 
-  <ItemGroup Label="Build">
-    <EmbeddedResource Include="Newtonsoft.Json\Dynamic.snk">
-      <Link>Exceptionless.Json.Dynamic.snk</Link>
-    </EmbeddedResource>
-  </ItemGroup>
-
-  <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'" Label="Build">
-    <DefineConstants>$(DefineConstants);NETSTANDARD;NETSTANDARD2_0;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_ASYNC;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;</DefineConstants>
-  </PropertyGroup>
-
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'" Label="Package References">
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0" />
     <PackageReference Include="System.Reflection.Emit.Lightweight" Version="4.7.0" />
   </ItemGroup>
 
   <ItemGroup>
     <PackageReference Include="System.Reflection.Metadata" Version="8.0.1" />
+    <PackageReference Include="System.Reflection.Metadata" Version="10.0.5" />
+    <PackageReference Include="System.Text.Json" Version="10.0.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
   </ItemGroup>
 
-  <PropertyGroup Condition="'$(TargetFramework)' == 'net462'" Label="Build">
-    <DefineConstants>$(DefineConstants);NET45;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_ASYNC;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CAS;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_REFLECTION_EMIT;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;</DefineConstants>
-  </PropertyGroup>
-
   <ItemGroup Condition="'$(TargetFramework)' == 'net462'" Label="Framework References">
     <Reference Include="Microsoft.VisualBasic" />
     <Reference Include="System.Configuration" />

src/Exceptionless/Models/Client/ClientConfiguration.cs

@@ -1,12 +1,12 @@
 namespace Exceptionless.Models {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class ClientConfiguration {
         public ClientConfiguration() {
             Settings = new SettingsDictionary();
         }
 
         public int Version { get; set; }
-        public SettingsDictionary Settings { get; private set; }
+        public SettingsDictionary Settings { get; set; }
 
         public void IncrementVersion() {
             Version++;

src/Exceptionless/Models/Client/Data/EnvironmentInfo.cs

@@ -1,5 +1,6 @@
+using System.Text.Json.Serialization;
+
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
     public class EnvironmentInfo : IData {
         public EnvironmentInfo() {
             Data = new DataDictionary();
@@ -67,13 +68,13 @@ public EnvironmentInfo() {
         /// <summary>
         /// The OS name that the error occurred on.
         /// </summary>
-        [Json.JsonProperty("o_s_name")]
+        [JsonPropertyName("o_s_name")]
         public string OSName { get; set; }
 
         /// <summary>
         /// The OS version that the error occurred on.
         /// </summary>
-        [Json.JsonProperty("o_s_version")]
+        [JsonPropertyName("o_s_version")]
         public string OSVersion { get; set; }
 
         /// <summary>

src/Exceptionless/Models/Client/Data/Error.cs

@@ -1,5 +1,5 @@
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class Error : InnerError {
         public Error() {
             Modules = new ModuleCollection();

src/Exceptionless/Models/Client/Data/InnerError.cs

@@ -1,5 +1,5 @@
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class InnerError : IData {
         public InnerError() {
             Data = new DataDictionary();

src/Exceptionless/Models/Client/Data/ManualStackingInfo.cs

@@ -3,7 +3,7 @@
 using Exceptionless.Extensions;
 
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class ManualStackingInfo {
         public ManualStackingInfo() {
             SignatureData = new Dictionary<string, string>();

src/Exceptionless/Models/Client/Data/Method.cs

@@ -2,7 +2,7 @@
 using System.Collections.Generic;
 
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class Method : IData {
         public Method() {
             Data = new DataDictionary();

src/Exceptionless/Models/Client/Data/Module.cs

@@ -2,7 +2,7 @@
 using System.Text;
 
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class Module : IData {
         public Module() {
             Data = new DataDictionary();

src/Exceptionless/Models/Client/Data/Parameter.cs

@@ -1,5 +1,5 @@
 namespace Exceptionless.Models.Data {
-    [Json.JsonObject(NamingStrategyType = typeof(Json.Serialization.SnakeCaseNamingStrategy))]
+
     public class Parameter : IData {
         public Parameter() {
             Data = new DataDictionary();