Feature/improve region counting

[drodarie]

Speed up of the volume and region density calculation for the literature measurements into average densities step
These calculations are now done all together at the same time, leveraging composition rules. Fix #64

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@376c0a8). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
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  Coverage        ?   97.80%           
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  Files           ?       22           
  Lines           ?     1458           
  Branches        ?        0           
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  Hits            ?     1426           
  Misses          ?       32           
  Partials        ?        0           

Flag	Coverage Δ
pytest	97.80% <100.00%> (?)

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