CDAP-540: Ported RecommendMovieProcedure to MovieRecommendService.

Implemented the MovieRecommendService in according to the RecommendMovieProcedure.
Old implementation is still available to compatibility with current user guides.
@sreevatsanraman What is your recommendation, make the code changes here as you suggested and fix any "visible" issues in other applications (which is not directly related to the "Procedures to Services porting"), or schedule it for a separate task?