[Feature request] MappableField to work on Mixins or interfaces

[AhmedLSayed9]

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i.e:

mixin FooMixin {
  @MappableField(key: 'some_new_key')
  String get some;
}

@MappableClass()
class Foo with FooMixin, FooMappable {
  const Foo({
    required this.some,
  });

  @override
  final String some;
}

or

abstract class FooInterface {
  SomeInterface({
    @MappableField(key: 'some_new_key') required this.some,
  });

  final String some;
}

@MappableClass()
class Foo with FooMappable implements FooInterface {
  const Foo({
    required this.some,
  });

  @override
  final String some;
}