Webhooks creating forum posts

[Middledot]

Summary

discord-api-docs#5007
Allows webhooks to create new threads in their forum channel with

await hook.send("## Important Stuff", name="Important Announcement")

I'm not too sure about this design though. Maybe something like hook.create_thread could be done instead?

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why
• 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, typehinting, examples, ...)

[Lulalaby]

Create forum post would sound better. Otherwise it could lead to confusion

[Dorukyum]

I think we should call this parameter thread_name, that should remove the confusion and reflect the API.

[Lulalaby]

Correct

[Middledot]

So it shoud be thread_name?