Add Window::show_window_menu

Add a method to request a system menu. The implementation
is provided only on Windows for now.

Co-authored-by: daxpedda <daxpedda@gmail.com>
Co-authored-by: Kirill Chibisov <contact@kchibisov.com>

src/platform_impl/linux/mod.rs

@@ -444,6 +444,9 @@ impl Window {
         x11_or_wayland!(match self; Window(window) => window.drag_resize_window(direction))
     }
 
+    #[inline]
+    pub fn show_window_menu(&self, _position: Position) {}
+
     #[inline]
     pub fn set_cursor_hittest(&self, hittest: bool) -> Result<(), ExternalError> {
         x11_or_wayland!(match self; Window(w) => w.set_cursor_hittest(hittest))