[FEAT] Add create_invite method to GuildForum

[Mias15]

Library Version

5.11.0

Describe the Bug

AttributeError: 'GuildForum' object has no attribute 'create_invite'

Steps to Reproduce

Try creating an invitation for a forum channel.

Expected Results

That you can create one.

Minimal Reproducible Code

No response

Traceback

No response

Checklist

• I have searched the open issues for duplicates.
• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.
• I have attempted to debug this myself, and I believe this issue is with the library

Additional Information

No response

[eightween]

This is a feature request, I suggest submitting a PR (you or anyone else for that matter) for implementing this.