Jax-RS improvements for interface declarations

[Gby56]

I stumbled upon an issue with the jax-rs rules, the code I'm testing is declaring the Paths in an interface and then implements it !
So I think the rule has to be rewritten to something like that, without a code block basically.

      - pattern: |
          @$METHOD
          @Path($PATH)
          $RETURNTYPE $FUNC(...)