FEATURE: Enable table captions in CKEditor

[so-grimm]

Description

The formatting options for the inline editor (Neos.Neos:Editable) offer an option for adding tables. Adding a table creates a <figure> tag. With the way this is currently set up, it is not possible to add a <figcaption> inside the <figure>.
However, the CKEditor does provide a feature for table captions, which is not yet integrated in Neos. It would be great to add this feature.
https://ckeditor.com/docs/ckeditor5/latest/features/tables/tables-caption.html

Steps to Reproduce

1. Add a text module which has set editorOptions: { formatting: { table: true } }
2. Add a table

Expected behavior

Once a table is added and the new buttons for the table appear in the toolbar, there should be another button for adding a table caption. The table caption is inline editable.

Actual behavior

No table caption can be added.

[What actually happened]

Affected Versions

Neos: 8.3

UI: 8.4

[73nici]

I would like to help with this feature :).

[73nici]

Currently version 16 is used in Neos.Ui, but table captions are possible with minimum version 28. A CKEditor5 update is therefore required.

https://github.com/ckeditor/ckeditor5/releases/tag/v28.0.0