Summary:
`StatusBarIOS` has been merged with `StatusBar`. See [Implement a StatusBar frame API](https://github.com/facebook/react-native/pull/16478)
## Changelog
[General] [Deprecate] - Warning for `StatusBarIOS`
Pull Request resolved: https://github.com/facebook/react-native/pull/25350
Test Plan: Warning prints when user imports `StatusBarIOS`
Differential Revision: D15963347
Pulled By: cpojer
fbshipit-source-id: 456a7f3ccb245bd89ad322d5a2649e3bf844ba24