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/conn_generic.go

@@ -0,0 +1,15 @@
+// +build !darwin,!linux,!freebsd,!windows
+
+package quic
+
+import "net"
+
+func newConn(c net.PacketConn) (connection, error) {
+	return &basicConn{PacketConn: c}, nil
+}
+
+func inspectReadBuffer(interface{}) (int, error) {
+	return 0, nil
+}
+
+func (i *packetInfo) OOB() []byte { return nil }