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