AlchemySerializeField in inherited class.

[Akeit0]

#53
Currently, Alchemy determines the drawing of an AlchemySerializeField by whether the class itself has an AlchemySerializeAttribute attached.
Therefore, the class will be rendered in the source class but not in the target class.
This can be resolved, but it needs to be specified.

1. DeclaringType with AlchemySerializeAttribute.
2. If AlchemySerializeAttribute is attached at least once in the inherited source, code generation is performed and drawing is also performed.

1 is easy to change and it seems natural.

[Akeit0]

#54
The SourceGenerator should also prevent the alchemySerializationData from being created multiple times by inheritance by using the type name <ClassName>_alchemySerializationData.