fix: Sanitize Variant values on Android

[limbonaut]

Sanitize Variant values on Android, specifically contexts and local variable values. This is important as certain Godot types cannot be converted to Android types, resulting in them being passed as nulls to the bridge layer. Also, introduce a tool to project for monkey-testing contexts with diverse value types.

• Fixes Local variables on Android incorrectly displayed as null #389

---

Note

Sanitizes Android Variant payloads (contexts, exception vars) and adds a demo "Tools" tab with buttons to run tests and send diverse context.

• Android:
  • Add sanitize_variant in src/sentry/android/android_util.{h,cpp} to normalize non-primitive Variant types and limit depth.
  • Use sanitization in AndroidSDK.set_context(...) and AndroidEvent.merge_context(...) to prevent nulls, and when serializing exception vars in AndroidEvent::add_exception.
• Demo (project):
  • Replace TabContainer/Tests with TabContainer/Tools; show %RunTestsButton only if res://test/mobile_tests.gd exists.
  • Add TestDiverseContextButton and _on_test_diverse_context_button_pressed() in project/mobile.{tscn,gd} to set SentrySDK.set_context("diverse_context", ...) with varied types and capture a message.
• Docs/Meta:
  • Update CHANGELOG.md with Android sanitization and context/local variable fix.

^{Written by Cursor Bugbot for commit 685c35e. This will update automatically on new commits. Configure here.}