feat: multiple routers

[iyifr]

You can now use multiple routers in H4

void main() async {
  var app = createApp(
    port: 5173,
    onRequest: (event) {},
    afterResponse: (event) => {},
  );

  var router = createRouter();
  var apiRouter = createRouter();

  app.use(router, basePath: '/');
  app.use(apiRouter, basePath: '/api');

  router.get("/", (event) {
    return 'Hello from /';
  });

  apiRouter.get("/", (event) {
    return 'Hi from /api';
  });
}

Non breaking change to app.use(H4Router) which can now be extended to be

app.use(H4Router, basePath: String)