http2: use and support non-empty DATA frame with END_STREAM flag

Adds support for reading from a stream where the final frame is a non-empty
DATA frame with the END_STREAM flag set, instead of hanging waiting for another
frame. When writing to a stream, uses a END_STREAM flag on final DATA frame
instead of adding an empty DATA frame.

BREAKING: http2 client now expects servers to properly support END_STREAM flag

Fixes: nodejs#31309
Fixes: nodejs#33891
Refs: https://nghttp2.org/documentation/types.html#c.nghttp2_on_data_chunk_recv_callback

src/node_http2.cc

@@ -1089,6 +1089,12 @@ int Http2Session::OnDataChunkReceived(nghttp2_session* handle,
       session->SendPendingData();
     }
   } while (len != 0);
+
+  // If end-stream flag is set, there is nothing more to read
+  if (flags & NGHTTP2_FLAG_END_STREAM) {
+    stream->EmitRead(UV_EOF);
+    return 0;
+  }
 
   // If we are currently waiting for a write operation to finish, we should
   // tell nghttp2 that we want to wait before we process more input data.