LMS-2033 Introduced generic types to the OmniscientDataSetHandler hierarchy.

...egistrator/AbstractDataSetRegistrationDetailsFactory.java

...strator/AbstractOmniscientTopLevelDataSetRegistrator.java

...isd/etlserver/registrator/DataSetRegistrationService.java

...registrator/DefaultDataSetRegistrationDetailsFactory.java

...lserver/registrator/DefaultEntityRegistrationService.java

...d/etlserver/registrator/JythonTopLevelDataSetHandler.java

...ver/registrator/api/v1/impl/AbstractTransactionState.java

...gistrator/api/v1/impl/DataSetRegistrationTransaction.java

...ver/registrator/JythonTopLevelDataSetRegistratorTest.java

...rator/api/v1/impl/DataSetRegistrationTransactionTest.java