Add widgets for custom layout to widget_toolkit_pin

[GoranPrime]

As a developer, I would like to have more control over how to show the various components in widget_toolkit_pin, with widgets which I can put on a page wherever I want while achieving the intended functionality.

ACs:

• Add & export PinCodeProvider wrapper for the widgets which will create & provide PinCodeBloc to it’s descendants
  • add PinCodeService pinCodeService parameter
  • add BiometricsLocalDataSource? biometricsLocalDataSource parameter in case of using biometrics
  • add String? localizedBiometricsReason parameter in case of using biometrics
  • add Function(dynamic)? onAuthenticated parameter
• Export PinCodeKeyboard widget:
  • emit current input pin to PinCodeBloc
  • add PinCodeCustomKey? deleteKeyButton parameter
  • add bool? isDisabled as a parameter, or from PinCodeBloc as default while loading
• Add & export PinCodeMaskedKeys widget:
  • add int? currentPinLength as a parameter, or from PinCodeBloc as default
  • add bool? isLoading as a parameter, or from PinCodeBloc as default
• Add & export PinCodeError widget:
  • add ErrorModel? error as a parameter, or from PinCodeBloc as default
  • add String Function(Object error) translateError parameter
• Provide our implementation with shake & slide animations on error as default
• Update documentation to reflect changes
• Update tests

Estimate: 28h