docs(examples): add some examples to track the memory usage

Related: fc21c4a

examples/memory-usage-webtransport/.gitignore

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+*.pem
+*.log

examples/memory-usage-webtransport/client.js

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+import { Socket } from "engine.io-client";
+import { X509Certificate } from "crypto";
+import { readFileSync } from "node:fs";
+import { WebTransport } from "@fails-components/webtransport";
+
+const cert = readFileSync("./cert.pem");
+const CLIENTS_COUNT = 100;
+
+global.WebTransport = WebTransport;
+
+for (let i = 0; i < CLIENTS_COUNT; i++) {
+  const socket = new Socket("ws://localhost:3000", {
+    transports: ["webtransport"],
+    transportOptions: {
+      webtransport: {
+        serverCertificateHashes: [
+          {
+            algorithm: "sha-256",
+            value: Buffer.from(
+              new X509Certificate(cert).fingerprint256
+                .split(":")
+                .map((el) => parseInt(el, 16))
+            ),
+          },
+        ],
+      },
+    },
+  });
+
+  socket.on("open", () => {});
+
+  socket.on("message", () => {});
+
+  socket.on("close", (reason) => {});
+}

examples/memory-usage-webtransport/generate_cert.sh

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+#!/bin/bash
+openssl req -new -x509 -nodes \
+    -newkey ec -pkeyopt ec_paramgen_curve:prime256v1 \
+    -days 14 \
+    -out cert.pem -keyout key.pem \
+    -subj '/CN=127.0.0.1'