@Override
  public Map<String, String> apply(CalendarModel calendarModel, TransformerContext context) {
    Map<String, String> calendar = new LinkedHashMap<>();
    calendar.put("name", calendarModel.getName());
    return calendar;
  }
Maps from a transfer calendar type to a Graph API calendar resource as defined by:
https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/calendar.
extensions/data-transfer/portability-data-transfer-microsoft/src/main/java/org/datatransferproject/transfer/microsoft/transformer/calendar/ToGraphCalendarTransformer.java