test(benches): add http2 chunks benchmark with default window size

benches/end_to_end.rs

@@ -145,6 +145,17 @@ fn http2_parallel_x10_req_10mb(b: &mut test::Bencher) {
 
 #[bench]
 fn http2_parallel_x10_req_10kb_100_chunks(b: &mut test::Bencher) {
+    let body = &[b'x'; 1024 * 10];
+    opts()
+        .http2()
+        .parallel(10)
+        .method(Method::POST)
+        .request_chunks(body, 100)
+        .bench(b)
+}
+
+#[bench]
+fn http2_parallel_x10_req_10kb_100_chunks_max_window(b: &mut test::Bencher) {
     let body = &[b'x'; 1024 * 10];
     opts()
         .http2()