New hooks to prevent user and channel modifications

[JohnXLivingston]

Describe the problem to be solved

This is related to this request: JohnXLivingston/peertube-plugin-filterregistrations#2

The plugin filterregistrations allow admins to forbid some pattern in usernames, emails, ... to prevent spam.
This plugin uses the hook api.user.signup.allowed.result to prevent account creation when these patterns are encountered.

Nowadays, many spam accounts are created, with spam links in there account or channel descriptions.

Peertube does not provide hooks like api.user.signup.allowed.result than can be called to reject some account/channel descriptions. The only existing backend hooks are action:api.user.updated and action:api.video-channel.updated which are called after the update, and can't be used to prevent it.

Describe the solution you would like

I'd like new hooks, similar to api.user.signup.allowed.result:

• filter:api.user.update.allowed.result
• filter:api.video-channel.update.allowed.result
• filter:api.video.update.allowed.result
• maybe also for comments?