code: def countStewards(self) -> int:
          
          # THIS SHOULD NOT BE DONE FOR PRODUCTION
          return sum(1 for _, txn in self.ledger.getAllTxn() if
                     (get_type(txn) == NYM) and (get_payload_data(txn).get(ROLE) == STEWARD))
docs: Count the number of stewards added to the pool transaction store
          Note: This is inefficient, a production use case of this function
          should require an efficient storage mechanism