feat: Add support for Guild Scheduled Event Recurrence

[DA-344]

Summary

Adds support for receiving, setting, and updating a Scheduled Event's recurrence rule.

Documentation: resources/guild-scheduled-event

Needs testing.

Information

• [ ] This PR fixes an issue.
• [x] This PR adds something new (e.g. new method or parameters).
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed).
• [ ] This PR is not a code change (e.g. documentation, README, typehinting, examples, ...).

Checklist

• [x] I have searched the open pull requests for duplicates.
• [ ] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
• [x] If type: ignore comments were used, a comment is also left explaining why.
• [x] I have updated the changelog to include these changes.

[Lulalaby]

Merge conflicts (complicated discord feature, requires intense testing)

[Lulalaby]

@DA-344 went ahead and fixed the merge conflicts for you. please double check

[Lumabots]

Not wanting to be disrespectful or anything, but it’s been some time since this hasn’t been updated or fixed as it’s implementing, if I understand correctly, a wrong/limited usage of schedule event (see Paillat comment). So should we switch in a way to #3025, which also implements this, fixing the current issue with the month days and month numbers? And imo the read only is a bit weird not saying for dpy but in py-cord we pretty much have nothing as read only so it disturb me a bit Since it’s also fixing a bunch of other stuff, overload, etc. (unrelated to guild even recurrence) Please let me now

[Paillat-dev]

As I already mentioned somewhere (forgot where) this PR should focus on Event Recurrence, and #3025 should focus on fixing the caching and parsing issues currently present.

@DA-344 Are you still planning to work on this ? There's a couple comments to be addressed.