[Enh]: Compounding Formula

[seandenigris]

For e.g. interest or inflation

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 37 lines in your changes missing coverage. Please review.

Project coverage is 93.59%. Comparing base (aa7cf30) to head (a5b0d17).

Files with missing lines	Patch %	Lines
source/Aconcagua-Core/CompoundingFormula.class.st	0.00%	31 Missing ⚠️
source/Aconcagua-Core/Measure.class.st	0.00%	6 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release-candidate      #36      +/-   ##
=====================================================
- Coverage              93.93%   93.59%   -0.35%     
=====================================================
  Files                     57       58       +1     
  Lines                  10062    10099      +37     
=====================================================
  Hits                    9452     9452              
- Misses                   610      647      +37     

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[seandenigris]

Looks like it's failing due to lack of test coverage. I'm happy to work on that if there is interest in this PR. @gcotelli?