feat(wm): add cmd to focus ws on target monitor

This commit adds a new command which allows the focusing of workspaces
on monitors other than the currently focused monitor by specifying a
monitor index.

Sending this command to komorebi will make the target monitor index the
currently focused monitor.

resolve #85

komorebi-core/src/lib.rs

@@ -76,6 +76,7 @@ pub enum SocketMessage {
     CycleFocusWorkspace(CycleDirection),
     FocusMonitorNumber(usize),
     FocusWorkspaceNumber(usize),
+    FocusMonitorWorkspaceNumber(usize, usize),
     ContainerPadding(usize, usize, i32),
     WorkspacePadding(usize, usize, i32),
     WorkspaceTiling(usize, usize, bool),