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/internal/logutils/frame.go

@@ -0,0 +1,33 @@
+package logutils
+
+import (
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
+	"github.com/lucas-clemente/quic-go/logging"
+)
+
+// ConvertFrame converts a wire.Frame into a logging.Frame.
+// This makes it possible for external packages to access the frames.
+// Furthermore, it removes the data slices from CRYPTO and STREAM frames.
+func ConvertFrame(frame wire.Frame) logging.Frame {
+	switch f := frame.(type) {
+	case *wire.CryptoFrame:
+		return &logging.CryptoFrame{
+			Offset: f.Offset,
+			Length: protocol.ByteCount(len(f.Data)),
+		}
+	case *wire.StreamFrame:
+		return &logging.StreamFrame{
+			StreamID: f.StreamID,
+			Offset:   f.Offset,
+			Length:   f.DataLen(),
+			Fin:      f.Fin,
+		}
+	case *wire.DatagramFrame:
+		return &logging.DatagramFrame{
+			Length: logging.ByteCount(len(f.Data)),
+		}
+	default:
+		return logging.Frame(frame)
+	}
+}