RichText 🧹

[ellatrix]

Description

This PR mostly moves code around.

• Move list controls to the list block, instead of embedding it in RichText.
• Move Autocomplete to the RichText wrapper with block context.
• Properly convert the multiline prop to a multilineTag.
• Use the rich text value to determine when to merge. This removes the dependency on the DOM package.
• Split onKeyDown in multiple functions.
• Reduce code indentation (in one occasion 5 → 2 tabs).
• Use hooks for RichText with block context.

How has this been tested?

E2e tests should pass.

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[draganescu]

I have tested these changes and found no issues, however there is too much here for me to simply approve. The gist is, things still work as expected after applying these changes.

[ellatrix]

Moved to #16905 because I renamed the branch to exclude the emoji.