feat: metrics draft

Author: geolffreym

metrics.go

@@ -6,12 +6,14 @@ package noise
 //
 // [docs]: https://arxiv.org/pdf/1509.04417.pdf
 type metrics struct {
+	bytesRecv     uint64 // bytes received
+	bytesSent     uint64 // bytes sent
 	handshakeTime uint32 // how long took the handshake to complete.
 	latency       uint16 // rtt in ms
 	bandwidth     uint16 // remote peer bandwidth
 	nonce         uint16 // nonce ordering factor
-	sent          uint16 // sent messages
-	recv          uint16 // received messages
+	sent          uint16 // counter sent messages
+	recv          uint16 // counter received messages
 }
 
 // calculate weight