Support editing web components (+shadow DOM) in CKEditor 5

This is an umbrella ticket for editing web components (with possible shadow DOM) inside CKEditor 5.

For now, this topic wasn't researched yet. We want to gather feedback first.

Known issues:

• Cursor disappears after deleting the text inside web component https://github.com/ckeditor/ckeditor5/issues/5724

Related tickets (for componentizing the entire editor):

• WebComponent for CKEditor 5
• Engine's support for running in a shadow DOM

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