Support for the max_selections poll parameter

[jkhsjdhjs]

Is your feature request related to a problem? Please describe.
It is currently not possible to select multiple options on a poll.

Describe the solution you'd like
It should be possible to select multiple options if max_selections allows for it.
Selecting another option shouldn't unselect previously selected options. Instead, selected options may be unselected by tapping them again.

Additional context
See also: element-hq/element-meta#2694

[nitn3lav]

This was already implemented for Element Web. However, the PR matrix-org/matrix-react-sdk#9519 was rejected because it wouldn't be cross platform across all versions of Element. I would be happy to implement this for iOS (both Element X and Element) and I might also take a look at Android. Could you please confirm that this would get merged (if code meets all requirements, etc.)

CC: @dbkr

[stefanceriu]

Could you please confirm that this would get merged

This is not the right place to ask that question. You should raise a ticket on https://github.com/element-hq/element-meta/issues and have somebody from the products team answer it.

Otherwise, I'm more than happy to look at the underlying implementation and merge it without enabling any changes on the UI level. (mind you, most of this logic should be on the rust side for EX)