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