Feedback: New WYSIWYG Editor Development API

[ssddanbrown]

Description

This issue is intended to gather feedback for the new WYSIWYG Editor Development API, introduced in BookStack v25.12 (The API, the editor was introduced a while before).

Initially the API is very thin to test the structure and documentation.
I've only implemented a few very common abilities used for customizations.

Going forward, instead of increasing the API surface area based upon guessing what folks may need, I'd prefer it to be driven by user requests, so please let me know what you need to achieve, and what abilities you think are currently missing to be able to achieve it.