Add G23 R(V) dependent relationship

[karllark]

In progress.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 :tada:

Comparison is base (85b35c7) 99.86% compared to head (388cab2) 99.87%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
+ Coverage   99.86%   99.87%   +0.01%     
==========================================
  Files           8        8              
  Lines         755      823      +68     
==========================================
+ Hits          754      822      +68     
  Misses          1        1              

Impacted Files	Coverage Δ
dust_extinction/shapes.py	100.00% <ø> (ø)
dust_extinction/helpers.py	100.00% <100.00%> (ø)
dust_extinction/parameter_averages.py	100.00% <100.00%> (ø)

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[karllark]

Doctest failing due to ADS issues. Not an issue for this PR.