Update ruff rules

[jessegrabowski]

Clean up the codebase using stricter ruff rules.

Several files need more systematic refactor as a result. These files were excluded from certain rules (C901, PLR0912, PLR0915, PLR2004). These should be addressed at some point, and the excludes should be removed.

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📚 Documentation preview 📚: https://gEconpy--56.org.readthedocs.build/en/56/

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[codecov]

Codecov Report

❌ Patch coverage is 72.97619% with 227 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.41%. Comparing base (abb1b3e) to head (6001d7a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
gEconpy/plotting.py	66.52%	79 Missing ⚠️
gEconpy/model/model.py	74.74%	49 Missing ⚠️
gEconpy/solvers/gensys.py	51.78%	27 Missing ⚠️
gEconpy/model/statespace.py	64.28%	15 Missing ⚠️
gEconpy/utilities.py	46.15%	14 Missing ⚠️
gEconpy/numbaf/overloads.py	30.00%	7 Missing ⚠️
gEconpy/model/perturbation.py	57.14%	6 Missing ⚠️
gEconpy/numbaf/intrinsics.py	28.57%	5 Missing ⚠️
gEconpy/parser/parse_distributions.py	71.42%	4 Missing ⚠️
gEconpy/model/steady_state.py	78.57%	3 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   75.29%   76.41%   +1.12%     
==========================================
  Files          33       33              
  Lines        4857     4872      +15     
==========================================
+ Hits         3657     3723      +66     
+ Misses       1200     1149      -51     

Files with missing lines	Coverage Δ
gEconpy/__init__.py	77.77% <100.00%> (ø)
gEconpy/classes/containers.py	97.84% <100.00%> (-0.01%)	⬇️
gEconpy/model/compile.py	100.00% <100.00%> (ø)
gEconpy/model/simplification.py	98.43% <100.00%> (+0.07%)	⬆️
gEconpy/parser/constants.py	100.00% <100.00%> (ø)
gEconpy/parser/gEcon_parser.py	98.47% <100.00%> (-0.02%)	⬇️
gEconpy/parser/parse_plaintext.py	98.43% <100.00%> (-0.10%)	⬇️
gEconpy/solvers/cycle_reduction.py	91.81% <100.00%> (-0.15%)	⬇️
gEconpy/solvers/shared.py	100.00% <100.00%> (ø)
gEconpy/classes/time_aware_symbol.py	93.22% <87.50%> (+3.82%)	⬆️
... and 21 more

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