Part of https://github.com/flutter/flutter/issues/117844 - [x] `google_sign_in_android` - https://github.com/flutter/packages/pull/4344 - [x] `google_sign_in_ios` - https://github.com/flutter/packages/pull/4941
Part of #117844
google_sign_in_android- [google_sign_in] Convert Android to Pigeon packages#4344google_sign_in_ios- [google_sign_in] Convert iOS to Pigeon packages#4941