feat(StatusPopupMenu): introduce `openHandler`

Similar to `closeHandler`, StatusPopupMenu can now have a customized `openHandler`
to run custom logic on open.

ui/StatusQ/src/StatusQ/Popups/StatusPopupMenu.qml

@@ -16,8 +16,15 @@ Menu {
 
     property int menuItemCount: 0
     property var subMenuItemIcons: []
+    property var openHandler
     property var closeHandler
 
+    onOpened: {
+        if (typeof openHandler === "function") {
+            openHandler()
+        }
+    }
+
     onClosed: {
         if (typeof closeHandler === "function") {
             closeHandler()