chore: add basic "benchmark" pkg

pkgs/benchmark/src/main.tsx

@@ -0,0 +1,9 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import App from "./App.tsx";
+
+createRoot(document.getElementById("root")!).render(
+	<StrictMode>
+		<App />
+	</StrictMode>,
+);