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