getPeople method
Will get a collection of PcoGroupsPerson objects (expecting many)
using a path like this: https://api.planningcenteronline.com/groups/v2/people
Implementation
Future<PcoCollection<PcoGroupsPerson>> getPeople(
{PcoGroupsPersonQuery? query}) async {
query ??= PcoGroupsPersonQuery();
var url = '$apiEndpoint/people';
return PcoCollection.fromApiCall<PcoGroupsPerson>(url,
query: query, apiVersion: apiVersion);
}