Fabric: `RNWrapManagedObject` and `RNUnwrapManagedObject` helpers
Fabric: `RNWrapManagedObject` and `RNUnwrapManagedObject` helpers

Summary: We use this pattern already and seems we use it more. Those two functions introduce a "semantical" wrappers for this context, so now there is no need to think which exact `__bridge ***` qualifier we should use, so it's much less error-prone.

Reviewed By: JoshuaGross

Differential Revision: D14896800

fbshipit-source-id: 85b86bfcefdad5aff0375e7172769df86c001506

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