Add host usb device in vm with utmctl

Use case: I have a certain VM that I always want to run with a usb device in shared passthrough mode from my host machine to my guest VM. I want this VM to always be running when the host machine is on, even across reboots.

In UTM 4.1.5, I'm able to use `utmctl` to automate starting / restarting the VM with `utmctl status` and `utmctl start`. Similarly, I'd like to be able to attach the USB device via `utmctl`.

My ultimate goal is to be able to (A) use UTM's UI to create a headless VM initially, and once I get it set up the way I like it, (B) quickly daemonize it to run permanently in the background on the host machine - similar to `docker compose` with `restart: always` policy. Currently, UTM is great at (A) but does not support (B).