Gets all contacts on the current device.
Once the contacts have been fetched, the first output is triggered.
If there is an error, the second output is triggered.
If the user hasn't given permission to access contacts, they will be requested to do so automatically.
iOS-only. Exclude creation of photo thumbnail URLs, which can have a performance overhead.
Number of outputs: 2
All contacts on the current device.
Thrown if an unknown error occurred while getting the contacts.