v2.0.0-dev.34

• Please refer to https://fzyzcjy.github.io/flutter_rust_bridge/guides/miscellaneous/whats-new for what's changed in V2.
• Add preamble for dart generated files #1949 (thanks @Krysl)
• Support same function name in different files #1944
• Support dart_format_line_length on generated .freezed.dart #1939
• Improve hints when Flutter hot restarts with Streams #1942
• Fix name conflict when using C++ keywords #1943
• Fix warning use of deprecated associated function chrono::NaiveDateTime::from_timestamp_micros #1941
• Bump Dart SDK source #1940