feat: add interoperability with shelf

[francescovallone]

As a developer, I would like to use the existing package and middleware developed for the shelf package in my Serinus application.

The Shelf Middlewares should be integrated inside the Serinus Middlewares using the factory constructor shelf. If the middleware ends the request for whatever reason then the Serinus Request should also be closed. The InternalResponse object of Serinus will also be modified by the headers, body, status code, and content type coming from the shelf responses.

The idea behind this feature is from @codekeyz