SP-136 BIS-21 refactor registration context

...strator/AbstractOmniscientTopLevelDataSetRegistrator.java

...lserver/registrator/DataSetRegistrationPersistentMap.java

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

.../etlserver/registrator/DataSetStorageAlgorithmRunner.java

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

...r/registrator/api/v1/IDataSetRegistrationTransaction.java

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

...ator/api/v2/DataSetRegistrationTransactionV2Delegate.java

...registrator/api/v2/IDataSetRegistrationTransactionV2.java

...er/registrator/api/v2/JythonTopLevelDataSetHandlerV2.java

...r/registrator/recovery/DataSetStorageRecoveryManager.java