add helper func to read csv file

[Tianhao-Gu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 52.50%. Comparing base (b483155) to head (9be8bc7).

Files	Patch %	Lines
src/spark/utils.py	25.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   61.66%   52.50%   -9.17%     
==========================================
  Files           3        3              
  Lines          60       80      +20     
==========================================
+ Hits           37       42       +5     
- Misses         23       38      +15     

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[MrCreosote]

assuming tests pass