refactor(tooling): Switch to ruff-format for formatting.

[elenakrittik]

Summary

Replaces black with ruff-format.

Depends on #1168

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• 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, ...)

[elenakrittik]

Ready for consideration!

[shiftinv]

I think I voiced my concerns about all-in-one tooling on discord before; to summarize, not being able to update linter and formatter separately anymore isn't ideal.
If one wants to update ruff to fix a linter bug, but doesn't want the formatting changes a newer version would potentially bring, you're pretty much out of luck.

Still, I'm willing to give this a try, especially given the pretty substantial performance difference. :>
There's potential for lots of fun merge conflicts in other PRs here, so I'd prefer only merging this after the next release - hope that's understandable

[elenakrittik]

I think I voiced my concerns about all-in-one tooling on discord before; to summarize, not being able to update linter and formatter separately anymore isn't ideal.

Don't see much of an issue with that, but given that

I'd prefer only merging this after the next release

We'll have a chance to test it 😄

[Enegg]

165ab84 Undo the formatting changes too

[elenakrittik]

165ab84 Undo the formatting changes too

Excuse me, why?

[Enegg]

Excuse me, why?

What's the point of fmt: off if the thing it was guarding from being formatted, has been formatted?
https://github.com/DisnakeDev/disnake/pull/1169/files#diff-6377fad5f75948c1eaa880c932839dd3f47b01c21056433ada31632cb518a665R480-R499