build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/test/ws-server.js

@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+const ws = require('nodejs-websocket');
+
+// simple echo server
+const server = ws.createServer(function(conn) {
+                   conn.on('text', function(str) {
+                     if (str === 'close') {
+                       server.close();
+                       return;
+                     }
+                     conn.sendText(str.toString());
+                   });
+                 }).listen(8001);