Add `getGridRowStart` util

[amanmahajan7]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.12%. Comparing base (107a3ae) to head (ec103f5). Report is 123 commits behind head on main.

Files with missing lines	Patch %	Lines
src/DataGrid.tsx	88.88%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3336      +/-   ##
==========================================
+ Coverage   83.10%   83.12%   +0.01%     
==========================================
  Files          47       47              
  Lines        5097     5101       +4     
  Branches      792      797       +5     
==========================================
+ Hits         4236     4240       +4     
  Misses        861      861              

Files with missing lines	Coverage Δ
src/DataGrid.tsx	88.87% <88.88%> (+0.03%)	:arrow_up:

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