v2.0.0-dev.9

• Please refer to https://fzyzcjy.github.io/flutter_rust_bridge/guides/miscellaneous/whats-new for what's changed in V2.
• Support ignoring a function via #[frb(ignore)] #1544 (thanks @JustSimplyKyle)
• Bump dependency to allow building if rust toolchain for esp32 is installed #1498 (thanks @mattiasgronlund)