getMessageGroups method

Will get a collection of PcoPeopleMessageGroup objects (expecting many) using a path like this: https://api.planningcenteronline.com/people/v2/people/1/message_groups

Implementation

Future<PcoCollection<PcoPeopleMessageGroup>> getMessageGroups(
    {PcoPeopleMessageGroupQuery? query}) async {
  query ??= PcoPeopleMessageGroupQuery();
  var url = '$apiEndpoint/message_groups';
  return PcoCollection.fromApiCall<PcoPeopleMessageGroup>(url,
      query: query, apiVersion: apiVersion);
}