MINOR: quic: Add packet loss and maximum cc window to "show quic"

Add the number of packet losts and the maximum congestion control window computed
by the algorithms to "show quic".
Same thing for the traces of existent congestion control algorithms.

Must be backported to 2.7 and 2.6.
diff --git a/src/quic_conn.c b/src/quic_conn.c
index 2d90ab3..d87bf05 100644
--- a/src/quic_conn.c
+++ b/src/quic_conn.c
@@ -8454,9 +8454,11 @@
 		chunk_appendf(&trash, "  [01rtt]             rx.ackrng=%-6zu tx.inflight=%-6zu\n",
 		              pktns->rx.arngs.sz, pktns->tx.in_flight);
 
-		chunk_appendf(&trash, "  srtt=%-4u rttvar=%-4u rttmin=%-4u ptoc=%-4u cwnd=%-6llu\n",
+		chunk_appendf(&trash, "  srtt=%-4u rttvar=%-4u rttmin=%-4u ptoc=%-4u cwnd=%-6llu"
+		                      " mcwnd=%-6llu lostpkts=%-6llu\n",
 		              qc->path->loss.srtt >> 3, qc->path->loss.rtt_var >> 2,
-		              qc->path->loss.rtt_min, qc->path->loss.pto_count, (ullong)qc->path->cwnd);
+		              qc->path->loss.rtt_min, qc->path->loss.pto_count, (ullong)qc->path->cwnd,
+		              (ullong)qc->path->mcwnd, (ullong)qc->path->loss.nb_lost_pkt);
 
 
 		/* Streams */