Custom statistics

[thorbjoernl]

Change Summary

Another step towards allowing users to specify their own custom statistics implementations. pyaerocom.stats.stats now provides a register_custom_statistic() method which allows adding a custom implementation for a statistic. It is not yet being read from the config dict directly but the functionality can be invoked by adding the following to cfg_benchmark.py:

    from pyaerocom.stats.stats import register_custom_statistic

    register_custom_statistic("customstat1", fun= lambda x, y, w: 5)
    register_custom_statistic("customstat2", fun= lambda x, y, w: 3)

Related issue number

fixes #1114

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 78.68%. Comparing base (e5f9ac6) to head (b19e0d9).
Report is 3 commits behind head on main-dev.

Files	Patch %	Lines
pyaerocom/stats/stats.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1138   +/-   ##
=========================================
  Coverage     78.68%   78.68%           
=========================================
  Files           126      127    +1     
  Lines         20084    20093    +9     
=========================================
+ Hits          15803    15811    +8     
- Misses         4281     4282    +1     

Flag	Coverage Δ
unittests	78.68% <85.71%> (+<0.01%)	⬆️

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[thorbjoernl]

Closing since we agreed that this wasn't a priority for the moment.