Implement map for multiple pyramids

[felixcremer]

This would close #38 .
This implements the map of multiple pyramids as the map of the base and the map on every subsequent level. This currently expects that all pyramids have the same number of levels. And I expect this would fail miserably if they don't have that.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.42%. Comparing base (ed984b9) to head (e7fceb2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   70.12%   71.42%   +1.29%     
==========================================
  Files           4        4              
  Lines         308      308              
==========================================
+ Hits          216      220       +4     
+ Misses         92       88       -4     

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