Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45693
This wires box shadow application for `ReactImageViewManager` to `BackgroundStyleApplicator` for setting shadows. This same logic will get copy-pasted to other view managers later up the stack (including Vito images, ScrollViews, etc, then eventually View), until we are able to consolidate to BaseViewManager.
Changelog: [Internal]
Reviewed By: rshest
Differential Revision: D60266016
fbshipit-source-id: eaa842f539ee1654ab719c7d341b4b748db7a15c