[TIMERS] Implement timer updates for RSocket

[y9vad9]

1. Look at how I provide state updates (GetStateUpdatesUseCase)
2. Add required method to StateMachine
3. Implement method in CoroutinesStateMachine, take a look at how it done with getState method
4. Create UseCase like GetTimerUpdatesUseCase
5. In UseCase, filter out anything connected with timer state (start / stop), leave timer settings update, user join and leaving events. Maybe, it would be better to map TimerEvent to TimerUpdate.