ViewPropTypes removed from React Native

This was previously just a problem with `react-native-web`, but now as of v69 `react-native` also doesn't support these.

So it's game over for RNRF working out of the box with the newest React Native.

Is there a plan to rectify this, and how are things going with maintenance on this library?

Just wondering if we need to make a decision soon about moving away from this and back to vanilla `react-native`.

Thanks, Nabs