CustomAPI Request and Response class generation

[mkholt]

Fix: CustomAPI fetch logic assumed a specific ObjectTypeCode, but that is environment specific - instead fetch base on the customapi table

Fix: Generated Request / Response classes should use the unique name, not the name (naming is weird in Dataverse, but unique is actually only unique per-API)

Chore: Update Scriban to newest stable without vulnerabilities and moving to an async-end-to-end logic when generating files

[Copilot]

Pull request overview

This PR updates Custom API metadata fetching and code generation so that Custom API Request/Response classes are generated using environment-agnostic metadata queries and the Custom API unique name (instead of display/name fields). It also migrates the generator pipeline to IAsyncEnumerable and updates template loading/rendering to async APIs (Scriban 7.x).

Changes:

• Fetch Custom APIs by querying the customapi table (solution-scoped) rather than relying on environment-specific component ObjectTypeCode assumptions.
• Generate Custom API Request/Response code using UniqueName for class naming and parameter/result keys, and add richer response constructors.
• Convert code generation + output writing pipeline to async (IAsyncEnumerable) and update templates/tests accordingly.

Reviewed changes

Copilot reviewed 29 out of 30 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/DataverseProxyGenerator.Tests/SingleFileTemplateTests.cs	Updates tests to use async code generation APIs.
tests/DataverseProxyGenerator.Tests/RetrieveMethodTests.cs	Migrates generator usage to GenerateCodeAsync + async LINQ enumeration.
tests/DataverseProxyGenerator.Tests/EnumGeneratorDuplicateTests.cs	Migrates enum generator tests to async generator API.
tests/DataverseProxyGenerator.Tests/DataverseProxyGenerator.Tests.csproj	Adds async-enumerable LINQ package dependency for async test enumeration.
tests/DataverseProxyGenerator.Tests/CustomApiMapperTests.cs	Adds unit coverage for Custom API type mapping + XML doc mapping.
tests/DataverseProxyGenerator.Tests/CustomApiGeneratorTests.Generates_Request_And_Response_For_All_Parameter_Types.verified.txt	Adds verified snapshot for generated Custom API request/response output.
tests/DataverseProxyGenerator.Tests/CustomApiGeneratorTests.cs	Adds/updates Custom API generator tests for naming, ctor behavior, nullability behavior.
tests/DataverseProxyGenerator.Tests/AttributeTypeCodeGenTests.cs	Updates attribute codegen test to async codegen enumeration.
src/DataverseProxyGenerator.Tool/Program.cs	Switches tool workflow to async generation + async file writing.
src/DataverseProxyGenerator.Core/Templates/EmbeddedTemplateProvider.cs	Converts template loading to async, implements Scriban loader async support.
src/DataverseProxyGenerator.Core/Templates/Body/CustomApiRequest.scriban-cs	Updates request template to use unique parameter names and new access patterns.
src/DataverseProxyGenerator.Core/Templates/Body/CustomApiResponse.scriban-cs	Updates response template to use unique property names and adds a convenience ctor.
src/DataverseProxyGenerator.Core/OutputWriter/IOutputWriter.cs	Changes output writer contract to async (WriteFilesAsync(IAsyncEnumerable<GeneratedFile>, ...)).
src/DataverseProxyGenerator.Core/OutputWriter/FileSystemOutputWriter.cs	Implements async file writing and async enumeration of generated files.
src/DataverseProxyGenerator.Core/Metadata/DataverseMetadataFetcher.cs	Refactors Custom API fetching to query customapi records linked to a solution and then load params/properties.
src/DataverseProxyGenerator.Core/Generation/Utilities/TypeSignatureHelper.cs	Formatting-only change.
src/DataverseProxyGenerator.Core/Generation/Mappers/ProxyClassMapper.cs	Formatting-only change.
src/DataverseProxyGenerator.Core/Generation/Mappers/CustomApiMapper.cs	Switches mapping to UniqueName-based identifiers and adds nullability-aware C# type mapping.
src/DataverseProxyGenerator.Core/Generation/IFileGenerator.cs	Changes generator contract to GenerateAsync returning IAsyncEnumerable<GeneratedFile>.
src/DataverseProxyGenerator.Core/Generation/ICodeGenerator.cs	Changes top-level generator contract to async (GenerateCodeAsync).
src/DataverseProxyGenerator.Core/Generation/Generators/XrmContextGenerator.cs	Updates generator to async template loading + RenderAsync.
src/DataverseProxyGenerator.Core/Generation/Generators/SingleFileGenerator.cs	Updates generator to async template loading + RenderAsync.
src/DataverseProxyGenerator.Core/Generation/Generators/ProxyClassGenerator.cs	Updates generator to async template loading + RenderAsync.
src/DataverseProxyGenerator.Core/Generation/Generators/IntersectionInterfaceGenerator.cs	Updates generator to async template loading + RenderAsync.
src/DataverseProxyGenerator.Core/Generation/Generators/HelperFileGenerator.cs	Updates generator to async template loading + RenderAsync.
src/DataverseProxyGenerator.Core/Generation/Generators/EnumGenerator.cs	Updates generator to async template loading + RenderAsync.
src/DataverseProxyGenerator.Core/Generation/Generators/CustomApiGenerator.cs	Adds async generation of 2 files per Custom API (request + response).
src/DataverseProxyGenerator.Core/Generation/CSharpProxyGenerator.cs	Converts multi-file generation orchestration to IAsyncEnumerable pipeline.
src/DataverseProxyGenerator.Core/Domain/CustomApiModel.cs	Adds Id and modernizes list initialization.
src/DataverseProxyGenerator.Core/DataverseProxyGenerator.Core.csproj	Upgrades Scriban and adds async-enumerable LINQ package dependency.

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