[Synchronizer] Use buffered ETSWriter
Use the new buffered_ets_writer https://gitlab.com/eshard/estraces/-/blob/master/estraces/formats/buffered_ets_writer.py to improve performances
Use the new buffered_ets_writer https://gitlab.com/eshard/estraces/-/blob/master/estraces/formats/buffered_ets_writer.py to improve performances