Add an easy way to get a CGImage from an NSImage

[amgleitman]

Proposal: Add an easy cross-platform way to get a CGImage from an NSImage

Summary

This is a minor syntactic change that would make working with NSImages easier.

Motivation

This is mostly for syntactic sugar purposes. For example, there are a number of places in react-native-macos that look something like this:

#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
  CGImageRef cgImage = image.CGImage;
#else // [TODO(macOS ISS#2323203)
  CGImageRef cgImage = [image CGImageForProposedRect:NULL context:NULL hints:NULL];
#endif // ]TODO(macOS ISS#2323203)

Ideally, it would be nice to just keep this the same line regardless of platform, whether through a category extension to NSImage or a couple of C-style functions in RCTUIKit.h, similar to what we have for various NSValues.

This has been added because it would have proven to be useful in a macOS implementation of react-native-svg. While simple to implement on the fly, this could prove useful for other modules that people may want to create, so it could probably find a better home in react-native-macos proper.

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