feat: Added mechanism for impute rules during aggregation

[marberts]

Closes #75 .

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.40%. Comparing base (69acb67) to head (86b672e).
⚠️ Report is 1 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   93.31%   93.40%   +0.09%     
==========================================
  Files          32       32              
  Lines        1331     1350      +19     
==========================================
+ Hits         1242     1261      +19     
  Misses         89       89              

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