Add OS implementation to the TerminatedUserSessionReader and for TerminatedUserSessionWriter interface

Testing Notes

1. Run 

   docker-compose -f docker-compose.yml --profile opensearch up -d

1. Start Optimize with 

   SPRING_PROFILES_ACTIVE=opensearch

1. The startup will fail and that's ok. Before the problem of crushing the app was missing TerminatedUserSessionWriterOS and TerminatedUserSessionReaderOS. So after the implementation of both of them next failing reason should become missing implementations of CollectionReader or CollectionWriter. 

1. Shutdown optimize
2. Restart optimize
3. Watch that no new errors show up in the logs
4. Do the same verifications as described in step 2 and make sure that everything is working the same