LibWeb: Add constructors for Text, DocumentFragment and Comment

These three nodes are the only nodes in the DOM spec with constructors.

Userland/Libraries/LibWeb/DOM/Text.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <LibWeb/DOM/Text.h>
+#include <LibWeb/DOM/Window.h>
 #include <LibWeb/Layout/TextNode.h>
 
 namespace Web::DOM {
@@ -23,4 +24,10 @@ RefPtr<Layout::Node> Text::create_layout_node()
     return adopt_ref(*new Layout::TextNode(document(), *this));
 }
 
+// https://dom.spec.whatwg.org/#dom-text-text
+NonnullRefPtr<Text> Text::create_with_global_object(Bindings::WindowObject& window, String const& data)
+{
+    return make_ref_counted<Text>(window.impl().document(), data);
+}
+
 }