dispose method
void
dispose()
Dispose all stream controllers
Implementation
void dispose() {
_modificationMessageController.close();
_userContextRequestController.close();
_liveVariationsIdsController.close();
_startCommandController.close();
_stopCommandController.close();
_userContextController.close();
_hitEventController.close();
_campaignActionController.close();
print('🧹 QA Message Service: All streams closed');
}