Make JAXBResponseParser parameterizable

By default, RestAnnotationProcessor builds the JAXBParser with the return type of the invoked method. This, however, can make it impossible to combine the JAXBResponseParser with the Transform annotation. The payload of the response to be parsed with the JAXBResponseParser could be of a different type than the output generated by the transformer
function.

This makes it necessary to configure the type for the response parser in the JAXBResponseParser annotation and set the return type of the invoked method to the type generated by the transformer function.

This change will also allow to combine the JABXResponseParser with the transformers needed to generate IterableWithMarker and PagedIterable instances.