Minimal implementation for ImageLoaderModule in ReactCxxPlatform (#52198)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52198

# Changelog:
[Internal] -

This provides an implementation of what was the RnCxx ImageLoaderModule stub inside ReactCxxPlatform, allowing the clients use dependency injection to provide the actual platform specific image loading functionality.

Reviewed By: javache

Differential Revision: D77015269

fbshipit-source-id: 7355dd75692c1f564de8c3daffd6c8a79182dc09