[Feature] Quiz mode in Polls

[Antreesy]

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Feature request

Since we're working on Polls enhancement with minor changes on backend, it should be a good timing to add Quiz mode:

• Raise interaction / involvement in meetings
• Knowledge check and data collection
• Gamification

Describe the solution you'd like

• Backend:
  • add new capability for quiz-like polls (maybe introduce new type or separate field to indicate it's a quiz poll)
  • add new property correct - 'string' for single answers / 'string[]' for multiple answers
  • return correct in API response for public polls all the time / after poll ends for hidden polls
• Web / Desktop / Mobile clients
  • allow to set correct answers during poll creation
  • prevent submitting of quiz polls if no correct answer was set
  • show correct answers for public polls all the time / after poll ends for hidden polls

Additional context

Telegram creation dialog	Telegram preview dialog