Part 5: Carry end-point params from the method to the impl.

Side effect of splitting the commits in multiple PRs. It actually has may fields: https://github.com/ArcBees/GWTP/blob/cv_rest_generators_v2_p17/gwtp-core/gwtp-dispatch-rest/src/main/java/com/gwtplatform/dispatch/rest/rebind/action/ActionDefinition.java