Implement MCMC mapping/optimization algorithm#1619

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victorli2002 wants to merge 5 commits intoflexflow:masterfrom

victorli2002:victor/mcmc_cherrypick

Commits on Oct 20, 2025

readding generic mcmc
vli42
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Commits on Oct 22, 2025

readding mcmc
vli42
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Commits on Dec 1, 2025

removing generic_mcmc_state
vli42
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Commits on Dec 2, 2025

MCMC modifications
vli42
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Commits on Dec 4, 2025

refactoring apply_substitution_and_update_machine_mapping, will look into moving it to the other file, also put the evaluate_substitution_ouput outside of apply_substitution since it has a side eff…
vli42
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