Drag handle for nodes

[juliusknorr]

We should add a drag handle next to nodes so they can easily be moved around. This contributes to #1914 but should be discussed in more depth before implementing especially in regards with other buttons that we already have next to the nodes (link menu, plus smart picker button, AI button).

@marcoambrosini Is this something you can come up with some design thoughts? Important for me would be that we carefully think about not overloading the UI with just another button

cc @max-nextcloud as we talked about it as well

Example From notion

[marcoambrosini]

Hi @juliusknorr, I think:

• The drag handle should be clickable and opening a menu that makes sense for the current block
• The link preview action can be integrated in this menu
• The Assistant can also be integrated in this menu