Integrate new ParserAPI

[magicmatatjahu]

We should integrate new ParserAPI in Generator but with fallback compatibility with old one, solution described in the asyncapi/parser-js#585:

• add support for new (optional!) field in template's config, apiVersion with possible values, v2 and v1 - v1 should be default value
• integrate new parser-js version in generator
• add possible tests
• update docs

[jonaslagoni]

This is actually blocking templates from using the new Modelina next branch... At least in the general sense. I tried upgrading to the .NET NATS template to use the new branch, but it's conflicting with the parsed AsyncAPI document not having the new parser API when using the AsyncAPI input processor in Modelina.

I could reparse everything again, but that does not seem right to do either 😄

Any suggestions how to fix it?

[github-actions]

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