class_docstr: Add operator that can take in undefined amount of inputs and saves results to '<input_name>_sum'
  column of result dataframe.
code: def __init__(self, factor: int) -> None:
      super().__init__()
      self._factor = factor
  
imports: from typing import NamedTuple
  from towhee.operator import Operator, SharedType
label_desc: Use image node_id 1 to create a new AddOperatorV2 object from inherited base classes: Operator with example: obj = AddOperatorV2(factor)