v2.0.0-dev.39

• Please refer to https://fzyzcjy.github.io/flutter_rust_bridge/guides/miscellaneous/whats-new for what's changed in V2.
• Do not create empty logs directory when not in verbose mode #2057
• Automatically strip prefix set_/get_ when it is a setter/getter function #2058
• Support adding errors to stream sink #2059
• Support import statements in dart_code #2061
• Add #[frb(type_64bit_int)] to pick preferred Dart big integer type #2065
• Support user-defined custom serializers and deserializers #2067
• Support attributes on impl block ; Improve ignore category message ; Fix external methods are wrong ignored #2069
• Support #[frb(name)] on fields to rename them ; Automatically rename Dart field names if they conflict with Dart keywords #2070
• Refactor internal code #2064 #2062
• Migrate to new Dart web package #2063