Add support for Projects in ticket creation

[Manuel-Manoury]

Hi 👋
I asked on the Figma Widget page if it was possible to support projects during ticket creation, but I figured I might as well create a PR for it 😄

⚠️ I didn't get the local server to run, I was a bit puzzled by the expected value for the VITE_WS_AUTH_SERVER_URL env var. I'm not used to developing stuff for Figma and/or Linear, so I might be missing something obvious 🤔 I did create an app on linear to get the expected information (well, I guess that's what was expected), but on Figma I got an error cannot access client storage without a plugin id even though I added the widget from the manifest which seem to have a proper id, and some errors when trying to interact with the widget as I didn't have a value for my auth WS. Anyway, I added some stuff to the readme when I did find some solutions to the issues I faced, but I guess I would need a more detailed guide to get the server to run locally (which could also help others contribute to your widget, I guess).

However, the query by itself works fine, and the UI looks ok to me, so I figured I could still open a PR with a disclaimer

[Manuel-Manoury]

👋 @XavierAgostini I don't know if you've got notifications for this repo or not and as I cannot set you as a reviewer / assignee, this is the only way I can make sure you've seen this PR, sorry if it's spamming you