82 add testing on aggregation methods and clean up code

[noamteyssier]

Codecov Report

Merging #83 (abaf360) into main (f6b1341) will increase coverage by 8.07%. The diff coverage is 78.21%.

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@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   64.25%   72.32%   +8.07%     
==========================================
  Files          30       30              
  Lines        1975     2219     +244     
==========================================
+ Hits         1269     1605     +336     
+ Misses        706      614      -92     

Impacted Files	Coverage Δ
src/aggregation/compute_aggregation.rs	0.00% <0.00%> (-42.33%)	:arrow_down:
src/aggregation/rra/alpha_rra.rs	0.00% <0.00%> (ø)
src/enrich/results.rs	89.28% <ø> (ø)
src/aggregation/utils.rs	93.22% <91.27%> (-6.78%)	:arrow_down:
src/enrich/enrichment_testing.rs	84.47% <96.00%> (+1.95%)	:arrow_up:
src/aggregation/mod.rs	100.00% <100.00%> (+100.00%)	:arrow_up:
src/aggregation/mwu_inc/inc.rs	100.00% <100.00%> (+100.00%)	:arrow_up:
src/aggregation/results.rs	100.00% <100.00%> (+100.00%)	:arrow_up:
src/utils/agg.rs	100.00% <100.00%> (+12.90%)	:arrow_up:
... and 4 more

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