feat: polls overhaul

[uhKevinMC]

Please describe the changes this PR makes and why it should be merged:

This PR resolves Issue #10326 and adds methods and properties found in similarly structured classes. This also creates a new manager, dubbed the PollAnswerVoterManager to store users that voted for the poll answer, similar to ReactionUserManager for users that reacted to a reaction.

This PR also patches a bug related to poll expiry dates being nullish in the future when polls have the option not to expire.

please do give feedback on this PR, I don't bite

• Add Poll Answer Voter/User Manager
• Add partials for Poll and PollAnswer
• Add support for partials Poll and PollAnswer in respective events
• Add typings for new properties, methods, classes, and partials
• Add tests
• Case testing
• Sanity check
• Finalize PR

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)

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[uhKevinMC]

I'm not able to test this locally, gotta love yarn..

Feedback on this would be appreciated!

Resolved

[vladfrangu]

This needs a rebase