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/streams_map_generic_helper.go

@@ -0,0 +1,18 @@
+package quic
+
+import (
+	"github.com/cheekybits/genny/generic"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+// In the auto-generated streams maps, we need to be able to close the streams.
+// Therefore, extend the generic.Type with the stream close method.
+// This definition must be in a file that Genny doesn't process.
+type item interface {
+	generic.Type
+	updateSendWindow(protocol.ByteCount)
+	closeForShutdown(error)
+}
+
+const streamTypeGeneric protocol.StreamType = protocol.StreamTypeUni