Added a new dart api function to add the functionality to get just a …

[eakers42]

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…contact name. If you only need a contact name, the phone number picker shows a dialog with repeated contacts that have multiple phone numbers. This does not work well. The API uses parameters to tell the native platform which type is being requested.

The code was added for Android and not iOS. However, the iOS code should not break and simply gets the phone number as I cannot develop for iOS.