Allow webhooks to create forum threads with settings

[GTB3NW]

Webhooks can currently create new forum threads with the thread_name field, however they're unable to configure any of the settings another user can. The following settings would be preferable for a webhook to be able to create and edit.

• auto_archive_duration
• rate_limit_per_user
• applied_tags

This seems to be a slight oversight in the current webhook workflow since a forum thread is a new citizen with its own settings, whereas a message is pretty thoroughly covered in the API.

Perhaps this should be a new webhook type instead of piggy backing off the existing endpoint? Similar to /slack /github etc.

[advaith1]

applied_tags can now be set on Execute Webhook: #6560

[GTB3NW]

Nice, thanks for the update!