Add TODO for later (#690)

Motivation:

Let's add a TODO as we might want to implement QUIC parsing by ourselves
to reduce overhead in the future.

Modifications:

Add TODO

Result:

Keep track of possible future optimization

codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/QuicHeaderParser.java

@@ -106,6 +106,9 @@ public void parse(InetSocketAddress sender,
         dcidLenBuffer.setInt(0, Quiche.QUICHE_MAX_CONN_ID_LEN);
         tokenLenBuffer.setInt(0, maxTokenLength);
 
+        // TODO: Maybe we should implement this by ourself and just save the extra JNI call and memory copies.
+        //       Parsing should be relative straight forward.
+        //       See https://datatracker.ietf.org/doc/html/rfc9000#section-17
         int res = Quiche.quiche_header_info(
                 Quiche.readerMemoryAddress(packet), packet.readableBytes(),
                 localConnectionIdLength,