UBER-1028 Improve list / sublist editing

[aonnikov]

Contribution checklist

Brief description

1. Use extension-list-keymap for better command handling in lists. See Backspace does not work properly ueberdosis/tiptap#3367
2. Lock focus inside editor so it does not leak to other components when typing

Checklist

• - UI test added to added/changed functionality?
• - Screenshot is added to PR if applicable ?
• - Does the code work? Check whether function and logic are correct.
• - Does Changelog.md is updated with changes?
• - Does the translations are up to date?
• - Does it well tested?
• - Tested for Chrome.
• - Tested for Safari.
• - Go through the changed code looking for typos, TODOs, commented LOCs, debugging pieces of code, etc.
• - Rebase your branch onto master and upstream branch
• - Is there any redundant or duplicate code?
• - Are required links are linked to PR?
• - Does new code is well documented ?

Related issues

A list of closed updated issues