feat(wm): add force-focus command

On rare occasions and usually with Firefox, the desired application will
fail to be focused with the regular focus commands. This commit
introduces a new command, force-focus, which can be used to simulate a
left-click on a window that has failed to take focus, since this is what
I have to do to work around the issue anyway.

komorebi-core/src/lib.rs

@@ -53,6 +53,7 @@ pub enum SocketMessage {
     CycleSendContainerToWorkspace(CycleDirection),
     SendContainerToMonitorWorkspaceNumber(usize, usize),
     MoveWorkspaceToMonitorNumber(usize),
+    ForceFocus,
     Close,
     Minimize,
     Promote,