Add example model with very large state-choice space

[timmens]

No description provided.

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (e72f3ba) 98.07% compared to head (963a098) 97.69%.

Files	Patch %	Lines
src/lcm/example_models/testing_example_models.py	63.63%	8 Missing ⚠️
tests/test_long.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   98.07%   97.69%   -0.38%     
==========================================
  Files          45       47       +2     
  Lines        2491     2521      +30     
==========================================
+ Hits         2443     2463      +20     
- Misses         48       58      +10     

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