[Feature request] Adding possibility to run "alacritty --embed=$x msg create-window"

It would be very useful to run msg with --embed attirbute.

I have a lot of instances which run inside of tabbed, if I close tabbed all of the sockets that was opened by alacritty remain. I know this is probably not alacritty issue, but this feature would fix it for me and maybe for someone else.