add benchmark tool

experimental/sdk/webpubsub-socketio-extension/examples/benchmark/README.md

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+# Benchmark
+
+1. Run the server
+```
+npm install
+node index.js <web-pubsub-connection-string>
+```
+
+2. Open "https://socket-io-admin.scm.azurewebsites.net/wwwroot/#/benchmark"
+
+3. Fill in your endpoint in the form and connect. 
+
+4. Fill test parameters then click "START BENCHMARK"

experimental/sdk/webpubsub-socketio-extension/examples/benchmark/index.js

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+const wpsExt = require("@azure/web-pubsub-socket.io")
+const express = require('express');
+const app = express();
+const http = require('http').Server(app);
+const io = require('socket.io')
+const { instrument } = require("@socket.io/admin-ui");
+
+const wpsOptions = {
+  hub: "eio_hub",
+  connectionString: process.argv[2] || process.env.WebPubSubConnectionString,
+}
+
+const samplingInterval = 20;
+
+async function main() {
+    const server = await io(http).useAzureSocketIO(wpsOptions)
+    instrument(server, { auth: false, mode: "production", });
+    const benchmarkNs = server.of("/benchmark");
+
+    var lastReceivedIndex = 0;
+
+    // Client -> Server time
+    var min = 10000, max = 0, sum = 0;
+
+    benchmarkNs.on('connection', (socket) => {
+        socket.on('client to server event', (data) => {
+            var index = data.split(",")[0];
+            var cost = new Date().getTime() - data.split(",")[1];
+
+            min = Math.min(min, cost);
+            max = Math.max(max, cost);
+            sum += cost;
+            if (index % samplingInterval == 0) {
+                console.log(`client -> Server (last=#${index}) | min: ${min} ms | max: ${max} ms | avg: ${sum / samplingInterval} ms`);
+                min = 10000, max = 0, sum = 0;
+            }
+            socket.emit("server to client event", (data));
+
+            lastReceivedIndex = index;
+        });
+    });
+
+    server.httpServer.listen(3000, () => {
+        console.log('Visit http://localhost:%d', 3000);
+    });
+}
+
+main()

experimental/sdk/webpubsub-socketio-extension/examples/benchmark/package.json

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+{
+    "name": "webpubsub-for-socketio-benchmark",
+    "version": "0.0.0",
+    "main": "index.js",
+    "private": true,
+    "license": "BSD",
+    "dependencies": {
+        "@azure/web-pubsub-socket.io": "1.0.0-alpha.20230803.1",
+        "@socket.io/admin-ui": "^0.5.1",
+        "express": "~4.17.1",
+        "socket.io": "^4.6.1"
+    },
+    "scripts": {
+        "start": "node index.js"
+    }
+}