Managed to do this in an API-compatible way although resuling output may
differ due to new dom handling in general, although user content is used
inline to remain as comptable as possible.
Due to queue serialization.
Added a test to check a couple of delete events.
Added ApiTokenFactory to support.
Also made a couple of typing/doc updates while there.
Related to #4373
Creates a new organsied formatting system for webhook data, with
interfaces for extending with custom model formatting rules.
Allows easy usage & extension of the default bookstack formatting
behaviour when customizing webhook events via theme system, and keeps
default data customizations organised.
This also makes the following webhook data changes:
- owned_by/created_by/updated_by user details are loaded for events with
Entity details. (POTENTIALLY BREAKING CHANGE).
- current_revision details are loaded for page update/create events.
Added testing to cover added model formatting rules.
For #3279 and #3218
