Transposes for vectorized aggregation

[andyleiserson]

Add additional macros in transpose implementation, to reduce repetitive code

[codecov]

Codecov Report

Attention: Patch coverage is 90.42553% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 90.46%. Comparing base (28411cd) to head (aa1554d).
Report is 7 commits behind head on main.

Files	Patch %	Lines
ipa-core/src/secret_sharing/vector/transpose.rs	90.10%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1008      +/-   ##
==========================================
- Coverage   90.61%   90.46%   -0.15%     
==========================================
  Files         167      167              
  Lines       23549    23806     +257     
==========================================
+ Hits        21339    21537     +198     
- Misses       2210     2269      +59     

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[andyleiserson]

I removed the special transpose for aggregation because that was the bulk of the missing coverage and enough to get over the threshold. The coverage situation will improve once the vectorized aggregation is added.

[akoshelev]

I trust that you do the right thing here, but I also find it very hard to comprehend what is going on there. Having no concrete suggestions how to improve things, my vote is to ship it