FEATURE: Migrate plugin on new standardization

[PcolBP]

FIXES:

1. Integration with newest Android Platforms
2. Fix memory leak on dispose
3. Add USER DENIED when user denies the prompt in handleError
4. Migrate plugin on newer flutters and dependencies.

For those who are interested in taking the plugin to your apps before author will approve:

  otp_autofill: 
    git:
      url: https://github.com/PcolBP/flutter-otp-autofill.git
      ref: pb/feature/migrate-plugin-on-new-standarization

⚠️ Caution, now errorHandler will also be triggered when user denies the prompt so it contains breaking changes since the last release.