Allow modules to alter the behaviour on entity save

Currently, if you have the Publish to Apple News checkbox checked, the API call is made on Save, regardless of things like published status, or other things that users of the module may care about.

I think it's OK to leave that behaviour as is, although it would be good to provide an alter to allow others to insert their own business logic to affect when the API call to Apple News happens, and whether or not it's in Draft mode. For instance, we'd like to make the push to Apple News respect the published status of the node and only push to Apple News as live when the node is published. We'd also like to decouple the API call from the node form Save (and say offload it to a queue), so that it doesn't add to the time it takes to save a node, which in our case, is already significant.

This feature request is to add an alter hook on node save to allow modules to affect when the API call to Apple News happens, and in general to alter the Apple News settings on the node form according to business rules.