Bulkfraction engine for pyaeroval

[dulte]

Change Summary

Tries to implement a way of evaluating bulk variables and fraction. Is needed for the "EC for GP revision" project

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 74.23313% with 42 lines in your changes missing coverage. Please review.

Project coverage is 78.50%. Comparing base (82a50eb) to head (e478075).
Report is 136 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/aux_var_helpers.py	10.81%	33 Missing ⚠️
pyaerocom/aeroval/bulkfraction_engine.py	94.23%	6 Missing ⚠️
pyaerocom/aeroval/obsentry.py	80.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1458      +/-   ##
============================================
+ Coverage     78.49%   78.50%   +0.01%     
============================================
  Files           139      140       +1     
  Lines         21090    21285     +195     
============================================
+ Hits          16554    16710     +156     
- Misses         4536     4575      +39     

Flag	Coverage Δ
unittests	78.50% <74.23%> (+0.01%)	⬆️

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[dulte]

99f5402 This commit changes alot, and needs to be better tested/looked over before used in ECforGP

[magnusuMET]

Code is easy to read and the bulk fractioning in an efficient way. Some small nits regarding types which should be easy to fix