Add a new poll type: Dot voting

[4jNsY6fCVqZv]

⚠️ This issue respects the following points: ⚠️

• I agree to follow Nextcloud's Code of Conduct.

Describe the goal you'd like to achieve

I often use this type of voting when facilitating group processes to give participants the opportunity to prioritise their available resources from a wide range of options.

For this new poll type, it should also be possible to set & publish an outcome as soon as the poll is completed.

Describe possible solutions

Inspiration from Loomio: https://help.loomio.com/en/user_manual/polls/proposal_types/index.html#dot-vote

Additional context

#765 (comment)

[dartcafe]

There are longstanding similar feature requests.

[4jNsY6fCVqZv]

There are longstanding similar feature requests.

And what do you feel and think about this in the context of the further development of the polls app?

[dartcafe]

I need time to think about a concept and then time to implement. I have them in my mind, but not the mood to start it until now.