code: public static <T> BulkheadOperator<T> of(Bulkhead bulkhead, Scheduler scheduler) {
          return new BulkheadOperator<>(bulkhead, scheduler);
      }
docs: Creates a BulkheadOperator.
  
  @param <T>       the value type of the upstream and downstream
  @param bulkhead  the Bulkhead
  @param scheduler the {@link Scheduler} where to publish
  @return a BulkheadOperator