get Contacts
fun getContacts(query: SourceQuery, onCompletion: (Either<List<Contact>, SippoResourceError>) -> Unit)
Fetches all the contacts from the specified query.
Parameters
query
Sources from which the contacts will be fetched.
on Completion
Callback that will be invoked when the request is completed. It will receive the contact list in case of success or a SippoResourceError otherwise.