chore(): add env variable for max batch size

[e11sy]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.41%. Comparing base (0eced98) to head (2094cc4).
⚠️ Report is 45 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #550      +/-   ##
==========================================
- Coverage   66.66%   62.41%   -4.26%     
==========================================
  Files          11       14       +3     
  Lines         174      290     +116     
  Branches       24       44      +20     
==========================================
+ Hits          116      181      +65     
- Misses         54      104      +50     
- Partials        4        5       +1     

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