When use `useBackingStore=true` in a parent component of a Image, the image won't be painted after the image been loaded.

``` jsx

```

I'm trying to fix this in https://github.com/jacobbubu/react-canvas/commit/301c7a1626b691f18571c370b425f33ce12bca7e.

I've given a callback to Image component for the calling when the fadeIn animation done, and then the `useBackingStore` prop in parent component will be changed to `true`.