move the PacketHeader struct from logging to qlog package

logging/packet_header.go

@@ -25,18 +25,3 @@ func PacketTypeFromHeader(hdr *Header) PacketType {
 		return PacketTypeNotDetermined
 	}
 }
-
-// PacketHeader is a QUIC packet header.
-type PacketHeader struct {
-	PacketType PacketType
-
-	PacketNumber  PacketNumber
-	PayloadLength ByteCount
-	// Size of the QUIC packet (QUIC header + payload).
-	// See https://github.com/quiclog/internet-drafts/issues/40.
-	PacketSize ByteCount
-
-	Version          VersionNumber
-	SrcConnectionID  ConnectionID
-	DestConnectionID ConnectionID
-}