keybinds: Add dispatcher for xmonad/qtile-style workspace switching (#4439)

* feat: implement xmonad/qtile-style workspace switching

Implements the focusWorkspaceOnCurrentMonitor dispatcher and function,
which implements XMonad/Qtile-style workspace switching.

When called, focusWorkspaceOnCurrentMonitor will:
1. Send the requested workspace to the current monitor,
2. If the workspace was previously active on a different monitor,
   replace it with the workspace that was previously active on the
   current monitor,
3. Focus the workspace on the current monitor.

* fix: address PR comments