feat: add polls feature

[ap-1]

Adds /poll command with six subcommands:

• setup (configure guild polls channel)
• create (create a poll with up to 10 options, optional multi-select)
• results (view vote counts)
• delete (for admins or poll authors to remove polls)
• close (to manually close the poll before expiry)
• myvote (check your own vote on an anonymous poll)

Closes https://github.com/ScottyLabs/dalmatian/issues/48

[maybe-yiyi]

just some things, not sure if some are feasible at all

• Should we have polls autoclose? What if people just want the polls to be open indefinitely?
• I think the results page should reference the original poll perhaps
  • is there a way to make it so you can see your own vote on anonymous polls? obviously we wouldn't be able to use ephemeral messages for that
• For me the polls are saying Poll by <@649388957007609879>•Today at 16:21 instead of mentioning the user
• i think we should put at least rolling counts on the ongoing polls
• does the poll embed builder just add every single voter to the voting list? it feels like you might hit embed limits on massive polls, and/or it crowds the answer choices
• what if i want to unvote from a poll

[ap-1]

just some things, not sure if some are feasible at all

* Should we have polls autoclose? What if people just want the polls to be open indefinitely?

* I think the results page should reference the original poll perhaps
  
  * is there a way to make it so you can see your own vote on anonymous polls? obviously we wouldn't be able to use ephemeral messages for that

* For me the polls are saying `Poll by <@649388957007609879>•Today at 16:21` instead of mentioning the user

* i think we should put at least rolling counts on the ongoing polls

* does the poll embed builder just add every single voter to the voting list? it feels like you might hit embed limits on massive polls, and/or it crowds the answer choices

* what if i want to unvote from a poll

• made duration optional so there's no expiry by default
• results embed links to the original poll message
• /poll myvote to check your vote on anonymous polls
• "Poll by" moved from footer to description
• rolling vote counts shown on ongoing poll embeds now
• voter list capped at 10 with "+ X more"
• allows unvoting now by removing the minimum selected values

[maybe-yiyi]

wait how do you unvote
it doesn't seem like i'm able to send a selection with 0 options selected or anything

[ap-1]

nevermind seems like that's not a thing, i just added an unvote button instead

[maybe-yiyi]

besides these things lgtm

didn't test attempting to delete polls without being the author, but the code looks correct.

• perhaps eventually we can whitelist/blacklist multiple roles
• maybe we consider whether it's necessary to enumerate the poll options, since we aren't voting using the enumeration nor does it really matter for poll results?

[maybe-yiyi]

great, thanks!

perhaps @TenType will want to review in terms of design, but it looks good to me.

[TenType]

I'll check this as well tonight, thanks yiyoung!

[TenType]

looks good, some things I think we should change:

• I'd prefer if we don't show who votes for what by default as it clutters the embed. maybe we can have a button "See voters" that replies with an ephemeral message of voters for each choice
• for anonymous polls, the number of people who voted for each choice is missing - can we also add the running count there as well?
• for time-limited polls, let's also show the time remaining via a discord timestamp
• I think it would be better to use components v2 for creating a poll (similar to how we do reaction redirect setup) than to accept the options via arguments, but this is okay to do in a separate PR

[maybe-yiyi]

Wait does this have ranked choice implemented

[TenType]

See the earlier comment