Add http.serve() API based on Fetch (Request -> Response)

What is the problem this feature will solve?

Node provides fetch, Request/Response, and Web Streams, but no high level server API using this model.

Other runtimes such as Deno and Bun expose a serve API based on the Fetch contract. In Node, similar patterns are commonly implemented in userland (e.g., frameworks like Hono), which indicates demand for this abstraction.

This was discussed in #42529 and received support, however that issue is focused on request.toWeb(), so opening a separate issue focused on this API.

What is the feature you are proposing to solve the problem?

Add a high-level http.serve(handler) API.

An example shape could be:

http.serve((req) => new Response("ok"))

handler: (Request) => Response | Promise<Response>

This would coexist with the existing http.createServer, and be a high level alternative using WHATWG APIs instead.

What alternatives have you considered?

• Continue using http.createServer directly.
• Implement this in userland, or use existing 3rd party solutions.

Empieza revisando la API http.createServer existente de Node y la discusión en el issue #42529. El trabajo propuesto consiste en definir y añadir http.serve(handler) usando Request y Response, manteniendo createServer disponible. Se considera terminado cuando la forma y el comportamiento de la API estén acordados, implementados y cubiertos para handlers síncronos y asíncronos.