Open chat UI as full panel

[ellisonbg]

For quick usage, the chat UI panel as a side panel makes a lot of sense. However, for some usage cases, that starts to be a ton of content for a side panel. I believe we should allow the user to open the chat UI as a full main area panel. We could do this by allowing them to move it between the side panels and main area ("or") or by allowing them to have it in both places if they want ("and"). The second is probably easier given that could just show a card on the launcher.

[dlqqq]

@ellisonbg Wow, it's impressive how some of the big ideas for JAI v3 were already in your mind in Apr 2023! Really cool to see our latest work closing one of our oldest issues.

Jupyter AI v3.0.0a0 supports this now 🎉. Closing.