Demo how to Stop/ForceStop in any State

[KonradBreitsprecherBkd]

Basic idea:

• Call lifecycleService->Stop() only in Running/Paused state.
• If the participant is in the wrong state to do so, a stopRequest is flagged and a timer is started.
• If a stop is requested and the participant reaches Running/Paused in time, the graceful stop via lifecycleService->Stop() is performed.
• If not, the timer fires and deletes the participant.