Future Roadmap: stop running validation on OpenAPI (/AsyncAPI) after every convertion

[adriankast]

If in the future the convertion algorithms & implementation for TD to OpenAPI instance generation (and later maybe also TD to AsyncAPI generation) turn out to be stable, one could move the OpenAPI validator to the development Dependencies and only check if the convertion result is valid in tests. This would speed up the convertion and make the production package size smaller.