Add Dart and Flutter support to ai-repomap

- Introduced tree-sitter-dart as a dependency for Dart parsing.
- Enhanced SymbolInfo and FileInfo interfaces to include properties specific to Dart and Flutter, such as isWidget, isStateful, and stateManagement.
- Implemented parsing logic for Dart files, including detection of Flutter widgets and state management patterns.
- Updated file detection to include Dart and Android file types.
- Added support for parsing Android manifest files and components.
- Improved handling of imports and dependencies in Dart files.