getResources method
Will get a collection of PcoGroupsResource objects (expecting many)
using a path like this: https://api.planningcenteronline.com/groups/v2/group_types/1/resources
Implementation
Future<PcoCollection<PcoGroupsResource>> getResources(
{PcoGroupsResourceQuery? query}) async {
query ??= PcoGroupsResourceQuery();
var url = '$apiEndpoint/resources';
return PcoCollection.fromApiCall<PcoGroupsResource>(url,
query: query, apiVersion: apiVersion);
}