TUN-4597: Add a QUIC server skeleton

- Added a QUIC server to accept streams
- Unit test for this server also tests ALPN
- Temporary echo capability for HTTP ConnectionType

vendor/github.com/lucas-clemente/quic-go/logging/packet_header.go

@@ -0,0 +1,27 @@
+package logging
+
+import (
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+// PacketTypeFromHeader determines the packet type from a *wire.Header.
+func PacketTypeFromHeader(hdr *Header) PacketType {
+	if !hdr.IsLongHeader {
+		return PacketType1RTT
+	}
+	if hdr.Version == 0 {
+		return PacketTypeVersionNegotiation
+	}
+	switch hdr.Type {
+	case protocol.PacketTypeInitial:
+		return PacketTypeInitial
+	case protocol.PacketTypeHandshake:
+		return PacketTypeHandshake
+	case protocol.PacketType0RTT:
+		return PacketType0RTT
+	case protocol.PacketTypeRetry:
+		return PacketTypeRetry
+	default:
+		return PacketTypeNotDetermined
+	}
+}