Config options to opt-in into kinda @raw_response_type mode

The directive `@raw_response_type` gives access to the response typings (or close to, due some strange `__is*`).
It would be nice to opt-in into generating raw response types without the need to add the directive to our operations.

This will make it easier to create mocks, and it is only about typings it does not heart the runtime.
Otherwise, we need to change every single query to add this directive.

This kind of typings improve the readability and testability of the code without affecting the pros of masking.