[feature] add computation of weighting functions

[slarosa]

No description provided.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.22% (target: -1.00%)	✅ 95.71%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (56ebc30)	2869	2556	89.09%
Head commit (d3fd595)	3086 (+217)	2756 (+200)	89.31% (+0.22%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#26)	233	223	95.71%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 90.52632% with 18 lines in your changes missing coverage. Please review.

Project coverage is 90.08%. Comparing base (56ebc30) to head (f78beeb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   90.11%   90.08%   -0.03%     
==========================================
  Files          17       18       +1     
  Lines        1942     2108     +166     
==========================================
+ Hits         1750     1899     +149     
- Misses        192      209      +17     

Files	Coverage Δ
pyrtlib/absorption_model.py	91.55% <100.00%> (ø)
pyrtlib/rt_equation.py	91.52% <100.00%> (ø)
pyrtlib/tb_spectrum.py	90.60% <100.00%> (+0.80%)	⬆️
pyrtlib/utils.py	94.07% <100.00%> (ø)
pyrtlib/weighting_functions.py	89.02% <89.02%> (ø)