feat: poll support

[Mishura4]

Title, I wasn't able to test MESSAGE_POLL_VOTE_ADD & MESSAGE_POLL_VOTE_REMOVE events because I'm just not receiving any event from the websocket whenever someone votes despite having the message intents

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• [x] I tested that my change works before raising the PR.
• [x] I have ensured that I did not break any existing API calls.
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