feat 💥: Forums rewrite

[LordOfPolls]

What type of pull request is this?

• Non-breaking code change
• Breaking code change
• Documentation change/addition
• Tests change

Description

Rewrites / ammends the forum implimentation to be more user friendly, and inline with the spec

Changes

• Update create post endpoint from private-beta code to spec
• Add NewThreadCreate event that only dispatches for brand new threads
• Add list_posts method to forums
• Add fetch_post method to forums
• Add get_post method to forums
• Add get_tag method to forums
• Update forum create_post to handle string, int, and object available tags

Checklist

• I've formatted my code with Black
• I've ensured my code works on Python 3.10.x
• I've tested my code

[Kigstn]

Gonna test this over the next days. But for now support for pinning posts is missing

[Kigstn]

create_tag() currently requires an emoji, this needs to be optional