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/DOMImplementation.webidl

@@ -0,0 +1,27 @@
+/* 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/. */
+/*
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#interface-domimplementation
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+[Exposed=Window]
+interface DOMImplementation {
+  [NewObject, Throws]
+  DocumentType createDocumentType(DOMString qualifiedName, DOMString publicId,
+                                  DOMString systemId);
+  [NewObject, Throws]
+  XMLDocument createDocument(DOMString? namespace,
+                             [LegacyNullToEmptyString] DOMString qualifiedName,
+                             optional DocumentType? doctype = null);
+  [NewObject]
+  Document createHTMLDocument(optional DOMString title);
+
+  [Pure]
+  boolean hasFeature(); // useless, always return true
+};