Use implementation ucrop-native for better image quality

The image quality after cropping is not good. I have compared other packages like `croppy` and used image compressor. It was superior in quality and compress that `flutter_image_cropper`.

I was this package is using `com.github.yalantis:ucrop:2.2.11`. According to readme from uCrop `com.github.yalantis:ucrop:2.2.11-native` gives better quality.