Responsive tables using figure element as per ckeditor library

Problem/Motivation

Drupal CkEditor tables are not responsive out of the box, such as CkEditor 5 which solves responsive tables using `overflow-x: auto` on the figure element

See relevant ckeditor 5 issues that have been merged.

• https://github.com/ckeditor/ckeditor5-table/pull/59
• https://github.com/ckeditor/ckeditor5/pull/14948/commits/754ee4149a69815...

Steps to reproduce

Create a table within ckeditor, save the page and review source markup or use inspect tool the table element is not a child of a figure element.
Ckeditor demo https://ckeditor.com/ckeditor-5/demo/feature-rich/ creates a table wrapped in a figure element.
I confirmed this on my drupal setup and verified the results on http://simplytest.me/

Proposed resolution

Update Drupal version of ckeditor, or/and add the figure element to the table widget.