refactor(query engine): parallel inputs reading in aggregator

[forshev]

Description

Parallel inputs reading in aggregator executor

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.91%. Comparing base (5964ab7) to head (dac2250).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
- Coverage   76.92%   76.91%   -0.01%     
==========================================
  Files         248      248              
  Lines       18851    18856       +5     
==========================================
+ Hits        14501    14504       +3     
- Misses       4350     4352       +2     

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