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/protocol/key_phase.go

@@ -0,0 +1,36 @@
+package protocol
+
+// KeyPhase is the key phase
+type KeyPhase uint64
+
+// Bit determines the key phase bit
+func (p KeyPhase) Bit() KeyPhaseBit {
+	if p%2 == 0 {
+		return KeyPhaseZero
+	}
+	return KeyPhaseOne
+}
+
+// KeyPhaseBit is the key phase bit
+type KeyPhaseBit uint8
+
+const (
+	// KeyPhaseUndefined is an undefined key phase
+	KeyPhaseUndefined KeyPhaseBit = iota
+	// KeyPhaseZero is key phase 0
+	KeyPhaseZero
+	// KeyPhaseOne is key phase 1
+	KeyPhaseOne
+)
+
+func (p KeyPhaseBit) String() string {
+	//nolint:exhaustive
+	switch p {
+	case KeyPhaseZero:
+		return "0"
+	case KeyPhaseOne:
+		return "1"
+	default:
+		return "undefined"
+	}
+}