Modify(DatastoreSessionRepository): implement method removeSessionByUserId.
Add(DatastoreUserRepository).
Add(DatastoreUserRepositoryTest).
Refactor(TestSuite): move to package com.clouway.
Modify(DatastoreUserRepository): implement methods registerIfNotExist and getUserByAttribute.
Modify(DatastoreUserRepository): implement retrieving of accounts associated by the user in method getUserByAttribute.