fix(ext/node): export request and response clases from http2 module (#25592)

Closes #20612
Closes #23326

This makes `qwik` work.

Author: bartlomieju

ext/node/polyfills/http2.ts

@@ -2295,7 +2295,7 @@ function onStreamTimeout(kind) {
   };
 }
 
-class Http2ServerRequest extends Readable {
+export class Http2ServerRequest extends Readable {
   readableEnded = false;
 
   constructor(stream, headers, options, rawHeaders) {
@@ -2523,7 +2523,7 @@ function isConnectionHeaderAllowed(name, value) {
     value === "trailers";
 }
 
-class Http2ServerResponse extends Stream {
+export class Http2ServerResponse extends Stream {
   writable = false;
   req = null;
 

tests/unit_node/http2_test.ts

@@ -378,3 +378,8 @@ Deno.test("[node/http2 client] connection states", async () => {
 
   assertEquals(actual, expected);
 });
+
+Deno.test("request and response exports", () => {
+  assert(http2.Http2ServerRequest);
+  assert(http2.Http2ServerResponse);
+});