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/ackhandler/ackhandler.go

@@ -0,0 +1,21 @@
+package ackhandler
+
+import (
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/utils"
+	"github.com/lucas-clemente/quic-go/logging"
+)
+
+// NewAckHandler creates a new SentPacketHandler and a new ReceivedPacketHandler
+func NewAckHandler(
+	initialPacketNumber protocol.PacketNumber,
+	initialMaxDatagramSize protocol.ByteCount,
+	rttStats *utils.RTTStats,
+	pers protocol.Perspective,
+	tracer logging.ConnectionTracer,
+	logger utils.Logger,
+	version protocol.VersionNumber,
+) (SentPacketHandler, ReceivedPacketHandler) {
+	sph := newSentPacketHandler(initialPacketNumber, initialMaxDatagramSize, rttStats, pers, tracer, logger)
+	return sph, newReceivedPacketHandler(sph, rttStats, logger, version)
+}