GrFN Intersection Graph Generation

[pauldhein]

This PR will implement a GrFNIntersectionGraph (GIG) class in automates/model_analysis/comparison.py as well as include a script that can be used to create a GIG given two GrFNs and their intersection information.

[codecov]

Codecov Report

Merging #176 (22be590) into master (e343a14) will increase coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   65.64%   65.69%   +0.05%     
==========================================
  Files          41       42       +1     
  Lines       11627    11988     +361     
==========================================
+ Hits         7633     7876     +243     
- Misses       3994     4112     +118     

Flag	Coverage Δ
unittests	65.69% <0.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
automates/model_analysis/comparison.py	0.00% <0.00%> (ø)
automates/model_assembly/sandbox.py	42.55% <0.00%> (-7.45%)	⬇️
automates/model_assembly/networks.py	71.46% <0.00%> (+1.68%)	⬆️
automates/model_assembly/structures.py	86.29% <0.00%> (+3.33%)	⬆️

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