change the implementation of the pyramid from being index-based to datacell-based

[inabao]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.44311% with 72 lines in your changes missing coverage. Please review.

❌ Your patch check has failed because the patch coverage (78.44%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
- Coverage   91.17%   91.01%   -0.16%     
==========================================
  Files         134      133       -1     
  Lines        8732     8812      +80     
==========================================
+ Hits         7961     8020      +59     
- Misses        771      792      +21     

Flag	Coverage Δ
cpp	91.01% <78.44%> (-0.16%)	⬇️

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Components	Coverage Δ
common	95.90% <100.00%> (+0.15%)	⬆️
datacell	93.29% <ø> (+1.18%)	⬆️
index	90.55% <76.77%> (-0.71%)	⬇️
simd	81.72% <ø> (ø)

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