Support `from<Name>(Uint8List <name>)` factory constructor

[SunlightBro]

This still has an issue with freezed.

[SunlightBro]

@simc This now supports any factory constructor with posParam type Uint8List, If the constructor and posParam name are the same.

@json
class Foo {
  Foo(this.name, this.age);

  final String name;
  final int age;

  factory Foo.fromName(Uint8List name) => _$FooFromName(name);
}

This still clashes with freezed fromJson (must be fixed in freezed to not generate when posParam is Uint8List). But for now can be workedaround in freezed class by just using something like:

factory MyFreezed.fromBytes(Uint8List bytes) => _$MyFreezedFromBytes(bytes);

[SunlightBro]

For https://github.com/simc/crimson/issues/11 fromJson factory constructor

[SunlightBro]

@simc can have a look/feedback at this PR.

[simc]

Thanks a lot for this PR!