In-Band SCONE Reporting over QUIC

The SCONE protocol relies on the receiver of SCONE packets to send bandwidth estimates back to the sender via unspecified application- layer messages. In some cases, a peer might have SCONE receive capability at the QUIC layer but not implement the necessary application level functionality. A new QUIC frame that directly reports the contents of received SCONE packets can address these use cases. There are no changes in the interaction with SCONE Network Elements.