Add API Specs Designer capability

I think it would bring great value, at least for me, to have the possibility of not only being able to test and API through Yaak but also be able to design APIs in it, for e.g. like Insomnia does or Swagger UI.

For me it would be extremely helpful to have the whole Design, Document and Test in Yaak ( right now i’m just asking for design ).

Right now I have to use Yaak and other tools to get the full end-to-end lifecycle of an API Development.