Make filter rules configurable.

Would be really nice to have this 2.x version and ckeditor5 compatibility: 🐛 Add 2.x branch for drupal:ckeditor5 compatibility Needs review any plans, @liquidcms? Are you planning to become Co-Maintainer?

@anybody... I do have it on my plate to migrate one of my projects over to CK5. Hopefully I get (back) to this in the next few weeks. This includes resolving some of the "not ck5 compatible" issues i have raised on a couple contrib modules as well as converting the 3 custom modules I have done, this being one of them.

And no, hoping to NOT become a co-maintainer on this project. :)

Haha, thanks! :)