Add support for default value on copyWith

[markokarajlovic]

I am using freezed in combination with bloc. I have 1 state class with enums for build and listener.

part 'example_state.freezed.dart';@freezed class ExampleState with _$ExampleState { const ExampleState._(); const factory ExampleState({ @Default(ExampleStateBuildStatus.loading) ExampleStateBuildStatus buildStatus, ExampleStateListenStatus? listenStatus, }) = _ExampleState; } enum ExampleStateBuildStatus { loading, loadSuccess, } enum ExampleStateListenStatus { error, }

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