getController method
Will get a collection of PcoServicesPerson objects (expecting many)
using a path like this: https://api.planningcenteronline.com/services/v2/series/1/plans/1/live/1/controller
Implementation
Future<PcoCollection<PcoServicesPerson>> getController(
{PcoServicesPersonQuery? query}) async {
query ??= PcoServicesPersonQuery();
var url = '$apiEndpoint/controller';
return PcoCollection.fromApiCall<PcoServicesPerson>(url,
query: query, apiVersion: apiVersion);
}