Paste text into VM through simulated typing

In the event that clipboard sync into the guest isn't supported (i.e. installation, no guest tools support), it's annoying when you need paste text into the VM that's annoying to type out by hand (i.e. license keys, a medium-sized set of commands). It would be nice if UTM handled this.

I could imagine this works by just making the VM display accept `paste:`, then have it send the keys required as if the user typed them (with some debounce).