Quote Posts implementation

Integrate a commonly requested and utilise feature: a quote posts.
Utilise these for the implementation https://codeberg.org/fediverse/fep/src/branch/main/fep/e232/fep-e232.md
https://misskey-hub.net/ns/
This is done via Misskey, Forkeys and Threads.
You can read about Threads methodology here https://engineering.fb.com/2024/03/21/networking-traffic/threads-has-entered-the-fediverse/

I would also recommend using this and other mechanisms for reply controls https://codeberg.org/fediverse/fep/src/branch/main/fep/5624/fep-5624.md

No files or tests are named in the issue. First read the referenced specs (FEP-E232, Misskey/Forkeys/Threads notes) to understand required quote-post behavior. Then locate the existing post/reply and federation/thread flow in the codebase and identify where quote-post objects are created, serialized, and rendered. Completion is shown when quote posts are handled end-to-end (create, display, and federation) according to the referenced implementation notes.

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