Added textencoder benchmark (#3589)

cli/tests/text_encoder_perf.js

+const mixed = "@Ā๐😀";
+
+function generateRandom(bytes) {
+  let result = "";
+  let i = 0;
+  while (i < bytes) {
+    const toAdd = Math.floor(Math.random() * Math.min(4, bytes - i));
+    switch (toAdd) {
+      case 0:
+        result += mixed[0];
+        i++;
+        break;
+      case 1:
+        result += mixed[1];
+        i++;
+        break;
+      case 2:
+        result += mixed[2];
+        i++;
+        break;
+      case 3:
+        result += mixed[3];
+        result += mixed[4];
+        i += 2;
+        break;
+    }
+  }
+  return result;
+}
+
+const randomData = generateRandom(1024);
+const encoder = new TextEncoder();
+for (let i = 0; i < 10_000; i++) encoder.encode(randomData);

tools/benchmark.py

@@ -28,6 +28,7 @@ exec_time_benchmarks = [
     ("workers_startup", ["tests/workers_startup_bench.ts"]),
     ("workers_round_robin", ["tests/workers_round_robin_bench.ts"]),
     ("text_decoder", ["cli/tests/text_decoder_perf.js"]),
+    ("text_encoder", ["cli/tests/text_encoder_perf.js"]),
 ]