cacheWidth and cacheHeigth support

[Gilianp]

Can you provide support for cacheWidth and cacheHeigth like flutter image widgets? The goal is to improve performance

[imsamgarg]

You can do the same by wrapping the FirebaseImageProvider with ResizeImage (provided by flutter lib).

return Image(
  image = ResizeImage(
    FirebaseImageProvider(FirebaseUrl("url")),
    height: 200, // == cacheHeight
    width: 200, // == cacheWidth
  ),
);