code: List<MapOnly> getMapOnlies(Field field) {
          List<MapOnly> mapOnly = reflectionHelper.getAnnotationWithMeta(field, MapOnly.class);
          List<MapOnlies> mapOnlies = reflectionHelper.getAnnotationWithMeta(field, MapOnlies.class);
          if (0 == mapOnly.size() && 0 == mapOnlies.size()) {
              return null;
          }
          List<MapOnly> res = new ArrayList<>();
          res.addAll(mapOnly);
          mapOnlies.forEach(mo -> Collections.addAll(res, mo.value()));
          return res;
      }
docs: Get the @MapOnly definitions which exist on a field, be it an individual {@link MapOnly} annotation or grouped
  in {@link MapOnlies} or both.
  
  @param field field to get annotations for
  @return list of annotations