Extend Dart bindings to mobile platforms (iOS XCFramework, Android AAR integration)

[Johnosezele]

The current Dart bindings #2 successfully generate and test on desktop platforms (Linux x86_64 and macOS ARM64/x86_64 via fat library). To enable full cross platform use in Flutter/Dart apps we need to extend support to iOS and Android.

[reez]

@Johnosezele are you interested in taking this on now that we have #2 merged? I can assign it to you.

[Johnosezele]

Yes pls @reez

[reez]

Yes pls @reez

awesome! assigned