UIManager: fill in getViewManagerConfig() on the NativeUIManager object
UIManager: fill in getViewManagerConfig() on the NativeUIManager object

Summary: Some callsites access `UIManager` from `NativeModules.UIManager` instead of importing directly from `UIManager.js`. Post TurboModule spec flow typing, we don't install `getViewManagerConfig()` on the NativeUIManager object anymore, only on the JS wrapper. So callsites not importing from `UIManager.js` will break. Example: https://github.com/react-native-community/react-native-maps/blob/dbf746d66ca1b42f2beb790bfbf4c0e3a74f3279/lib/components/decorateMapComponent.js#L32-L40

Reviewed By: JoshuaGross, mdvacca

Differential Revision: D15588353

fbshipit-source-id: 2c2b497dae0660abf15acb2f944546fe03e9bb0a

hammerandchisel/react-native,facebook/react-native,exponentjs/react-native,hammerandchisel/react-native,hammerandchisel/react-native,exponentjs/react-native,exponent/react-native,arthuralee/react-native,myntra/react-native,exponentjs/react-native,exponent/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hammerandchisel/react-native,janicduplessis/react-native,pandiaraj44/react-native,janicduplessis/react-native,exponentjs/react-native,facebook/react-native,myntra/react-native,hammerandchisel/react-native,exponent/react-native,exponent/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,hoangpham95/react-native,hoangpham95/react-native,pandiaraj44/react-native,myntra/react-native,janicduplessis/react-native,myntra/react-native,javache/react-native,arthuralee/react-native,pandiaraj44/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,exponent/react-native,janicduplessis/react-native,facebook/react-native,hammerandchisel/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,exponentjs/react-native,hammerandchisel/react-native,facebook/react-native,hoangpham95/react-native,pandiaraj44/react-native,arthuralee/react-native,exponentjs/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,hoangpham95/react-native,hoangpham95/react-native,janicduplessis/react-native,exponent/react-native,javache/react-native,hoangpham95/react-native,hammerandchisel/react-native,hoangpham95/react-native,javache/react-native,exponentjs/react-native,facebook/react-native,hoangpham95/react-native,exponent/react-native,janicduplessis/react-native,myntra/react-native,exponentjs/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,exponent/react-native,javache/react-native