ignore Android binding warnings (#4423)

* Fix Android binding warnings - treat as errors but suppress expected warnings

- Enable TreatWarningsAsErrors for Android bindings project
- Suppress expected/unavoidable Android binding warnings (BG8xxx codes)
- These warnings are caused by Java interface circular dependencies in Sentry SDK
- Warnings are documented with explanations for each type
- New warning types will now break the build for review
- Analyzed 1528 warnings and confirmed they're due to binding limitations
- Solution preserves existing Metadata.xml strategic type removals

---------

Co-authored-by: Stefan Pölz <38893694+Flash0ver@users.noreply.github.com>

Author: bruno-garcia

src/Sentry.Bindings.Android/Sentry.Bindings.Android.csproj

@@ -6,6 +6,19 @@
     <!-- This gets resolved by the DownloadSentryAndroidSdk target -->
     <SentryNativeNdkVersion></SentryNativeNdkVersion>
     <Description>.NET Bindings for the Sentry Android SDK</Description>
+
+    <!-- Android binding warnings - these are largely unavoidable due to Java interface circular dependencies -->
+    <!-- Only suppress warnings that are confirmed to be expected/unavoidable -->
+    <!-- BG8801: Invalid parameter types - caused by circular interface dependencies in Sentry Java SDK -->
+    <!-- BG8C01: Invalid base interface - interfaces reference types removed by Metadata.xml -->
+    <!-- BG8701: Invalid return types - return types reference unresolvable interfaces -->
+    <!-- BG8800/BG8700: Unknown/Invalid types - types intentionally removed by Metadata.xml -->
+    <!-- BG8605/BG8606: Missing Java types - Compose UI types not available in our binding context -->
+    <!-- BG8604: Missing ancestor types - nested types whose parents are removed -->
+    <!-- BG8502/BG8503: Interface invalidation - cascade effect from other binding issues -->
+    <!-- BG8401/BG8400: Field/property conflicts - resolved individually in Metadata.xml where needed -->
+    <!-- BG8C00: Base interface not found -->
+    <NoWarn>$(NoWarn);BG8801;BG8C01;BG8701;BG8800;BG8700;BG8605;BG8606;BG8604;BG8502;BG8401;BG8400;BG8503;BG8C00</NoWarn>
   </PropertyGroup>
 
   <!-- Use a separate readme, and don't add the changelog to the nuget. -->