macOS: add command+number hotkeys for showing windows

I would love if command+number could show/focus windows. The biggest win would just be showing the main UTM window: if I close it, then it's mildly annoying to reopen it with the menubar. My instinct is to hit command+0 or command+1 for the main window. I guess the full "standard" Mac behavior would be command+0 shows the main window and command+[1-9] shows currently running VM windows.