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 62.17949% with 59 lines in your changes missing coverage. Please review.

Project coverage is 78.38%. Comparing base (23809dc) to head (4e2a182).
Report is 349 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	79.38%	20 Missing ⚠️
pyaerocom/aeroval/obsentry.py	69.23%	4 Missing ⚠️
pyaerocom/aeroval/experiment_processor.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1458      +/-   ##
============================================
- Coverage     78.87%   78.38%   -0.49%     
============================================
  Files           136      140       +4     
  Lines         20863    21289     +426     
============================================
+ Hits          16455    16687     +232     
- Misses         4408     4602     +194     

Flag	Coverage Δ
unittests	78.38% <62.17%> (-0.49%)	⬇️

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[dulte]

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