stylizationAsync function
Implementation
Future<Mat> stylizationAsync(InputArray src, {double sigmaS = 60, double sigmaR = 0.45}) async {
  final dst = Mat.empty();
  return cvRunAsync0((callback) => cphoto.cv_stylization(src.ref, dst.ref, sigmaS, sigmaR, callback), (c) {
    return c.complete(dst);
  });
}