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/handshake/session_ticket.go

@@ -0,0 +1,48 @@
+package handshake
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/lucas-clemente/quic-go/internal/wire"
+	"github.com/lucas-clemente/quic-go/quicvarint"
+)
+
+const sessionTicketRevision = 2
+
+type sessionTicket struct {
+	Parameters *wire.TransportParameters
+	RTT        time.Duration // to be encoded in mus
+}
+
+func (t *sessionTicket) Marshal() []byte {
+	b := &bytes.Buffer{}
+	quicvarint.Write(b, sessionTicketRevision)
+	quicvarint.Write(b, uint64(t.RTT.Microseconds()))
+	t.Parameters.MarshalForSessionTicket(b)
+	return b.Bytes()
+}
+
+func (t *sessionTicket) Unmarshal(b []byte) error {
+	r := bytes.NewReader(b)
+	rev, err := quicvarint.Read(r)
+	if err != nil {
+		return errors.New("failed to read session ticket revision")
+	}
+	if rev != sessionTicketRevision {
+		return fmt.Errorf("unknown session ticket revision: %d", rev)
+	}
+	rtt, err := quicvarint.Read(r)
+	if err != nil {
+		return errors.New("failed to read RTT")
+	}
+	var tp wire.TransportParameters
+	if err := tp.UnmarshalFromSessionTicket(r); err != nil {
+		return fmt.Errorf("unmarshaling transport parameters from session ticket failed: %s", err.Error())
+	}
+	t.Parameters = &tp
+	t.RTT = time.Duration(rtt) * time.Microsecond
+	return nil
+}