Fetch the changed contacts from contactChange notification or contact store

Originator:k.nishant293
Number:rdar://646839378 Date Originated:
Status:Open Resolved:
Product:iOS Product Version:
Classification:API feature request Reproducible:
 
As a developer I should be able to fetch the changed contacts from the notification or the contactStore instead of iterating over all of the contacts over and over again.
Add an api in CNContactStore to fetch the changed contact from a time duration i.e. a delta of contacts. 
Other alternative can be to pass the changed objects in the CNContactStoreDidChange notification.

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