TUN-6530: Implement ICMPv4 proxy

This proxy uses unprivileged datagram-oriented endpoint and is shared by all quic connections

connection/quic_test.go

@@ -682,6 +682,7 @@ func testQUICConnection(udpListenerAddr net.Addr, t *testing.T) *QUICConnection
 		&tunnelpogs.ConnectionOptions{},
 		fakeControlStream{},
 		&log,
+		nil,
 	)
 	require.NoError(t, err)
 	return qc