feat(SIP-39): Websocket sidecar app (#11498)

* WIP node.js websocket app

* Load testing

* Multi-stream publish with blocking reads

* Use JWT for auth and channel ID

* Update ws jwt cookie name

* Typescript

* Frontend WebSocket transport support

* ws server ping/pong and GC logic

* ws server unit tests

* GC interval config, debug logging

* Cleanup JWT cookie logic

* Refactor asyncEvents.ts to support non-Redux use cases

* Update tests for refactored asyncEvents

* Add eslint, write READMEs, reorg files

* CI workflow

* Moar Apache license headers

* pylint found something

* adjust GH actions workflow

* Improve documentation & comments

* Prettier

* Add configurable logging via Winston

* Add SSL support for Redis connections

* Fix incompatible logger statements

* Apply suggestions from code review

Co-authored-by: David Aaron Suddjian <1858430+suddjian@users.noreply.github.com>

* rename streamPrefix config

Co-authored-by: David Aaron Suddjian <1858430+suddjian@users.noreply.github.com>

superset-websocket/utils/client-ws-app/public/javascripts/app.js

@@ -0,0 +1,63 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+let socketCount = 0;
+let messageCount = 0;
+let lastMessage;
+
+function ts() {
+  return new Date().getTime();
+}
+
+const cookieName = document.getElementById('cookie').innerHTML;
+const tokenData = document.getElementById('tokens').innerHTML;
+const tokens = JSON.parse(tokenData);
+
+function connect() {
+  if (socketCount >= tokens.length) return;
+
+  // using https://github.com/js-cookie/js-cookie
+  // eslint-disable-next-line no-undef
+  Cookies.set(cookieName, tokens[socketCount], { path: '' });
+
+  // Create WebSocket connection.
+  let url = `ws://127.0.0.1:8080?last_id=${ts()}`;
+  const socket = new WebSocket(url);
+
+  // Connection opened
+  socket.addEventListener('open', function () {
+    socketCount++;
+    document.getElementById('socket-count').innerHTML = socketCount;
+    connect();
+
+    socket.send('Hello Server!');
+  });
+
+  // Listen for messages
+  socket.addEventListener('message', function (event) {
+    messageCount++;
+    lastMessage = event.data;
+  });
+}
+
+connect();
+
+setInterval(() => {
+  document.getElementById('message-count').innerHTML = messageCount;
+  document.getElementById('message-debug').innerHTML = lastMessage;
+}, 250);