docs: def begin_batch(self):
          '''
          Starts the batch operation. Intializes the batch variables
  
          is_batch:
              batch operation flag.
          batch_table:
              the table name of the batch operation
          batch_partition_key:
              the PartitionKey of the batch requests.
          batch_row_keys:
              the RowKey list of adding requests.
          batch_requests:
              the list of the requests.
          '''
          self.is_batch = True
          self.batch_table = ''
          self.batch_partition_key = ''
          self.batch_row_keys = []
          self.batch_requests = []