docstr: Merges two tuples together additively.
code: def merge_accumulators(self, acc1: Tuple, acc2: Tuple):
      """Merges two tuples together additively."""
      return tuple(a + b for a, b in zip(acc1, acc2))
  
imports: import abc
  import copy
  from dataclasses import dataclass
  from typing import Any, List, Optional, Tuple
  import numpy
  import math
  import pipeline_dp
  from pipeline_dp import budget_accounting
  from pipeline_dp import dp_computations
  from analysis import metrics
  from analysis import poisson_binomial
  from pipeline_dp import partition_selection
label_desc: Use image node_id 2 for calling the UtilityAnalysisCombiner obj's underlying member method code with example usage: obj.merge_accumulators(acc1, acc2) and returns: tuple