Add support for a table summary

[Mgsy]

📝 Provide a description of the new feature

In CKEditor 4 it's possible to add a summary to the table, represented as summary attribute on <table> element. To keep the content compatibility, we should make sure that this attribute is not removed during the conversion.

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[Reinmar]

I wonder if table’s summary could not be implemented the same way as image’s alt text. The icon would not work, though :(

[jwylarsen]

Summary attribute is deprecated https://developer.mozilla.org/en-US/docs/Web/HTML/Element/table#summary