Add handling of collections with polymorphic types

As far as I have seen there is no support for inheritance. I have worked on a very similar project (annotation procession based json parser) with features like you implemented (you have more features though, but the basic features are the same). However, I have implemented Inheritance resolution similar like Jackson did. Since my annotation processor is in alpha and I consider your parser as more advanced, I consider to switch over to your parser and I would like to ask you if you would accept pull requests for inheritance or are you currently working on that? Or does your roadmap specifies inheritance for a much later version like 2.0.0?

If you are interested in we can specify together the annotations.

The issue names no files, tests, or entry points. First clarify the intended inheritance and polymorphic-collection behavior, including the proposed annotations and whether a pull request is wanted. Completion criteria are not defined in the issue.

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