flutter_rust_bridge: integrate via native assets backend

[opheliagame]

https://cjycode.com/flutter_rust_bridge/quickstart

install and integrate

cargo install flutter_rust_bridge_codegen --version 2.13.0-beta.5 
flutter_rust_bridge_codegen integrate --integration-backend native-assets
flutter_rust_bridge_codegen generate

check with example app

cd example
flutter run 

iOS files get updated

• Swift Package Manager integration
• Finished migration to UIScene lifecycle