MsGraphAdmin classes for calendar

Added classes for MsGraphAdmin for working with Calendars and Events

Calendar Events

MsGraphAdmin::calendarEvents()->userid($userId)->get();
MsGraphAdmin::calendarEvents()->userid($userId)->find($calendarId, $eventId);
MsGraphAdmin::calendarEvents()->userid($userId)->store($calendarId, $data);

Calendars

MsGraphAdmin::calendars()->userid($userId)->get();
MsGraphAdmin::calendars()->userid($userId)->find($eventId);
MsGraphAdmin::calendars()->userid($userId)->store($data);
MsGraphAdmin::calendars()->userid($userId)->update($data);

Events

MsGraphAdmin::events()->userid($userId)->get();
MsGraphAdmin::events()->userid($userId)->find($eventId);
MsGraphAdmin::events()->userid($userId)->store($data);
MsGraphAdmin::events()->userid($userId)->update($data);
MsGraphAdmin::events()->userid($userId)->delete($data);