Summary:
In iOS, seems we have no ways to check wether the cached item is from disk or memory, only `storagePolicy == NSURLCacheStorageAllowedInMemoryOnly ` we can think it's from memory. So we need to add a new result like `disk/memory`?
[iOS] [Added] - Add Image query cache result type
Pull Request resolved: https://github.com/facebook/react-native/pull/23608
Differential Revision: D14205902
Pulled By: cpojer
fbshipit-source-id: 29c253878b5c6776cd4776508e24c57e6bfa7dfa