Major refactor of statistics functions

[robbibt]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.29730% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.2%. Comparing base (ab09f43) to head (0d54b4f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
eo_tides/stats.py	97.0%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #37     +/-   ##
=======================================
+ Coverage   80.6%   82.2%   +1.5%     
=======================================
  Files          6       6             
  Lines        646     641      -5     
  Branches     112     108      -4     
=======================================
+ Hits         521     527      +6     
+ Misses        76      70      -6     
+ Partials      49      44      -5     

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