[upstream] Support full-screen editing - distraction free mode when it is available upstream

Problem/Motivation

Currently the CKEditor 5 is missing the full screen editing feature which was available in CKEditor 4. Since the switch to CKEditor 5 is forced with Drupal 10 content creators will be forced to the standard width provided by the theme. In case of the admin theme this could be problematic.

There is a discussion at Github that summarizes why that feature is necessary: https://github.com/ckeditor/ckeditor5/issues/1235

Is there any chance it will come to Drupal 10?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet