PyGTM integration

[dschick]

This PR provides an integration of the pyGTM project into the udkm1Dsim as a new additional polarization scattering simulation.

[codecov]

Codecov Report

Attention: Patch coverage is 11.37521% with 522 lines in your changes missing coverage. Please review.

Project coverage is 22.16%. Comparing base (54ce349) to head (1a0ae2a).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
udkm1Dsim/simulations/scattering.py	4.89%	505 Missing ⚠️
udkm1Dsim/structures/layers.py	70.17%	17 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #97      +/-   ##
===========================================
- Coverage    24.36%   22.16%   -2.21%     
===========================================
  Files           10       10              
  Lines         3066     3646     +580     
===========================================
+ Hits           747      808      +61     
- Misses        2319     2838     +519     

Files with missing lines	Coverage Δ
udkm1Dsim/__init__.py	100.00% <100.00%> (ø)
udkm1Dsim/structures/layers.py	72.08% <70.17%> (-0.25%)	⬇️
udkm1Dsim/simulations/scattering.py	8.41% <4.89%> (ø)

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