feat: Localisation support.

[FayeDel]

About

This mega PR:

• Implements localisation completely, with type-checking, Locale object usage support and documentation support.
• Implement per-route rate-limit exhaustion on the HTTP client. This also utilises the application/json header correctly.
• Fixes listener/function removal for Extensions on extension reload/remove.
• Fixes the timestamp instantiation on the Embed object.
• Points the OpenCollective URL from the repo to the correct URL.
• Fixes circular importing from c54a35c
• Implements the pagination response introduced from GET /guilds/{guild.id}/bans.

Checklist

• I've ran pre-commit to format and lint the change(s) made.
• I've checked to make sure the change(s) work on 3.8.6 and higher.
• This fixes/solves several issues:
  • [BUG] Phantom timestamp being added to Embeds at HTTP POST response #684
  • [BUG] Client.remove()/Client.reload() does not remove old listeners #665
  • [BUG] leave_guild throwing an error #598
  • [REQUEST] Command localization #511
• I've made this pull request for/as: (check all that apply)
  • Documentation
  • Breaking change
  • New feature/enhancement
  • Bugfix

[AstreaTSS]

...I like this PR in general, but it's kind of odd. Shouldn't these be broken up into separate commits? That would be much clearer when scrolling back through the commit history.

[EepyElvyra]

...I like this PR in general, but it's kind of odd. Shouldn't these be broken up into separate commits? That would be much clearer when scrolling back through the commit history.

I agree on that, I was thinking the same before

[AstreaTSS]

...I like this PR in general, but it's kind of odd. Shouldn't these be broken up into separate commits? That would be much clearer when scrolling back through the commit history.

I agree on that, I was thinking the same before

Yeah, it's weird for "localization support" to have bug fixes out of all things.
It also makes it harder to review and test.
(Also, yeah, I did mean separate PRs haha 😅.)

[FayeDel]

Yeah, it's weird for "localization support" to have bug fixes out of all things.
It also makes it harder to review and test.
(Also, yeah, I did mean separate PRs haha 😅.)

Yeah this PR wasn't meant to be squashed, rather merged/rebased. (But also, I wasn't sure what else to title it 🤷🏻‍♀️)

[AstreaTSS]

Yeah, it's weird for "localization support" to have bug fixes out of all things.
It also makes it harder to review and test.
(Also, yeah, I did mean separate PRs haha 😅.)

Yeah this PR wasn't meant to be squashed, rather merged/rebased. (But also, I wasn't sure what else to title it 🤷🏻‍♀️)

That's fine and all and the commit history itself is very clean... but this should really be separated regardless of the merge strategy. It's near impossible to test everything and ensure everything is working fine, and also makes digging through PRs to find what is introduced harder.

IMO there's absolutely no reason this shouldn't be closed and separated into various PRs.

[EepyElvyra]

Seems to look good, I can't see anything bad in the latest commits