Slashmenu work

[17Amir17]

• Implement the actions (make sure new blocks are created when selecting an option)
• Show correct keyboard shortcuts for actions
• Test with playwright

Note: In this pull request I changed the way setBlockHeading works, which fixes an issue with the heading being set for all blocks that contain the selected block (for both slash and bubble menus) see the issue below:
Before

After

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[YousefED]

See some comments inline. My main feedback is is that the slash menu should insert new blocks (a sibling below the current block) instead of modify the current block. See notion as example

[17Amir17]

Great! Some small comments :)

Could you add lists and numbered lists as well?

I've added them however, I didn't implement the keyboard shortcuts yet because I want to use commands I create in the bubblemenu-dropdown branch (I still have to change the commands).

[YousefED]

1 comment, but then I think we're ready to merge this!