PIM-2127 : add a method in product repository interface to filter by ids
PIM-2127 : implement the filter by ids method in ORM product repository
PIM-2127 : update the category filter to make it storage agnostic
PIM-2127 : add filter by ids method in MongoDB product repository (not
yet implemented)
PIm-2127 : update the filter by ids method to drop the QueryBuilder type
hint
PIM-2127 : update the filter by ids method
PIM-2127 : Fix CS
Merge pull request #837 from akeneo/mongo/category_filter

Category filter (MongoDB support)