getOwner method
Will get a collection of PcoGivingPerson objects (expecting many)
using a path like this: https://api.planningcenteronline.com/giving/v2/batches/1/owner
Implementation
Future<PcoCollection<PcoGivingPerson>> getOwner(
{PcoGivingPersonQuery? query}) async {
query ??= PcoGivingPersonQuery();
var url = '$apiEndpoint/owner';
return PcoCollection.fromApiCall<PcoGivingPerson>(url,
query: query, apiVersion: apiVersion);
}