Finitequiz: Save played time in gameresult which is sent to backend

[WuestFlorian]

Current Behavior

The game result ist sent to the backend without the played time. But the backend now needs the played time in the GameResultDTO (Gamify-IT/issues#379)

Expected Behavior

The played time of a minigame run is tracked and will be sent in the GameResultDTO

DoD

• [x] played time of a minigame run is tracked
• [x] played time will be sent trough the GameResultDTO after a game run is finished