API endpoints to promote a thread into a toplevel guild channel or demote a toplevel guild channel to a thread

[erkinalp]

In many guilds, a few thread channels gradually gain prominence, which makes it into an ongoing discussion, which make them have even more activity than toplevel channels they are in. For this purpose, I am hereby proposing two API endpoints:

Promote thread to toplevel: POST /channels/:id/promote

Permissions: MANAGE_GUILD and MANAGE_CHANNELS on all affected channels
Preconditions: Public threads and news threads can be promoted. Public thread gets promoted to guild-text, news thread gets promoted to announcement.
Postconditions: On success, returns 200 and the new channel object. The promoted channel is positioned just after its former parent. Membership data is retained. Thread starter messages are retained.

Reparent thread/demote toplevel channel: MOVE /channels/:id

Arguments: Takes the destination channel in the form of the header Destination: /channels/:id.
Permissions: MANAGE_GUILD and MANAGE_CHANNELS on all affected channels
Preconditions: Text and announcement channels can be demoted. Guild gets demoted to public thread, announcement gets demoted to news thread. Public thread, private thread, news thread channels can be reparented to other guild text channels.
Postconditions: On success, returns 200 and the new channel object with the parent stated in the Destination. System messages are retained.

[MichailiK]

If this even becomes a thing, instead of introducing 2 new endpoints, it'd be better to use the existing PATCH /channels/:id endpoint & allowing Developers to set the parent_id to a text channel or null.