feature request: add loss_packets and lost_bytes fields to noq::ConnectionStats

[Sherlock-Holo]

in quinn, we can access the loss_packets and lost_bytes data in the quinn::ConnectionStats.path

however, I can't find the similar fields in noq

[Sherlock-Holo]

I found these fields in path stats, this can work for me

[flub]

It would be trivial to add them to the connection stats as well. I do think that would make sense because with multipath you otherwise can lose the information from closed paths easily.

[flub]

See #560