Add table and raw HTML support for rich text editor

[ksewo]

Describe the problem feature solves It would allow for creating better content. Tables are commonly used in comparisons and datasets; therefore, it should be possible to add them with a built-in editor easily.

Support for raw HTML/markdown would be extremely useful, so if there is a situation in which something isn't implemented in the editor, then it can be implemented by writing HTML or markdown.

Describe the solution you'd like I'd like a rich text editor to have the possibility to add tables and make different operations on it, i.e. adding/removing rows, columns, etc.

Describe alternatives you've considered I've considered creating a custom component for rich text, but it would take more time to implement and the current implementation of a rich text editor seems fine for me, but I only miss the table support feature.

Acceptance criteria

• [ ] Possibility to add a table and modify it
• [ ] Possibility to add raw HTML

[dziraf]

I'm moving this to design system repository.