Add documentaton how to pass config of various datatypes to CKE5 plugins

This came up again as a blocker for CKEditor 5 ecosystem adoption: https://drupal.slack.com/archives/C01GWN3QYJD/p1684981833259909?thread_t....

Wim Leers → credited b_sharpe → .

Wim Leers → credited mglaman → .

Thanks for surfacing, Bryan & Matt!

The reason this was never documented is cited by @nod_:

Not sure where to document. We don't have accessible/generated JS documentation and we don't have yml documentation at all :/

I propose we are pragmatic and just document it in ckeditor5.api.php, where the documentation already lives of what the ckeditor5.config key expects as values.

The last submitted patch, 13: 3311239-13.patch, failed testing. View results →