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/wire/ping_frame.go

@@ -0,0 +1,27 @@
+package wire
+
+import (
+	"bytes"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+// A PingFrame is a PING frame
+type PingFrame struct{}
+
+func parsePingFrame(r *bytes.Reader, _ protocol.VersionNumber) (*PingFrame, error) {
+	if _, err := r.ReadByte(); err != nil {
+		return nil, err
+	}
+	return &PingFrame{}, nil
+}
+
+func (f *PingFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
+	b.WriteByte(0x1)
+	return nil
+}
+
+// Length of a written frame
+func (f *PingFrame) Length(version protocol.VersionNumber) protocol.ByteCount {
+	return 1
+}