Context:
When we added the user/group sync with OPT-2549 we encountered the use case that we would like to load the profile of multiple users at once, oo import users more efficiently in batches. However currently there is no way to perform this on the bpm platforms rest api.

AT:

• `EngineContext.getUsersById/getGroupByIds` uses the idIn query parameter of the engine rest api instead of calling get by id for every id https://docs.camunda.org/manual/7.12/reference/rest/user/get-query/#query-parameters