script: Move code generation and webidl files to new script_bindings crate. (#35157)

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script_bindings/webidls/EventTarget.webidl

@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+/*
+ * https://dom.spec.whatwg.org/#interface-eventtarget
+ */
+
+[Exposed=(Window,Worker,Worklet,DissimilarOriginWindow)]
+interface EventTarget {
+  [Throws] constructor();
+  undefined addEventListener(
+    DOMString type,
+    EventListener? callback,
+    optional (AddEventListenerOptions or boolean) options = {}
+  );
+
+  undefined removeEventListener(
+    DOMString type,
+    EventListener? callback,
+    optional (EventListenerOptions or boolean) options = {}
+  );
+
+  [Throws]
+  boolean dispatchEvent(Event event);
+};
+
+dictionary EventListenerOptions {
+  boolean capture = false;
+};
+
+dictionary AddEventListenerOptions : EventListenerOptions {
+  // boolean passive = false;
+  boolean once = false;
+};