Add "--boundaries" option for "focus-back-and-forth" command

[keabarnes]

I would like the option to limit focus-back-and-forth to going back and forth on the current workspace only instead of jumping between workspaces.

I've found that if I truly wanted to swap between workspaces, workspace-back-and-forth is better as the last thing that was focused on the other workspace is still focused when you return.

[jpnance]

I agree! I use spectrwm on my Linux machines and this is a useful part of my muscle memory. Because Aerospace currently only tracks one bit of window focus history, I assume that a bit more state would have to be added to keep track of the most recently focused window per workspace but it would be a welcome change to me!