Refactored causal graph generation in a problem method

[Framba-Luca]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 5.00% and project coverage change: -0.02% ⚠️

Comparison is base (d5e5dcd) 84.98% compared to head (2c7a32c) 84.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
- Coverage   84.98%   84.96%   -0.02%     
==========================================
  Files         198      198              
  Lines       26006    26014       +8     
==========================================
+ Hits        22102    22104       +2     
- Misses       3904     3910       +6     

Files Changed	Coverage Δ
unified_planning/plot/causal_graph_plot.py	30.00% <0.00%> (+20.72%)	⬆️
unified_planning/plot/utils.py	35.84% <0.00%> (ø)
unified_planning/model/problem.py	78.89% <3.94%> (-10.57%)	⬇️
unified_planning/model/__init__.py	100.00% <100.00%> (ø)

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