Add public egui_kittest::Node constructor

crates/egui_kittest/src/lib.rs

@@ -735,10 +735,7 @@ impl<'a, State> Harness<'a, State> {
 
     /// The root node of the test harness.
     pub fn root(&self) -> Node<'_> {
-        Node {
-            accesskit_node: self.kittest.root(),
-            queue: &self.queued_events,
-        }
+        Node::new(self.kittest.root(), &self.queued_events)
     }
 
     /// Spawn a real native eframe window running this harness's app, reusing its [`egui::Context`].