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fix: correct _has_transition_hooks init and prevent histograph input mutation

_has_transition_hooks and _has_post_transition_hooks were initialized to true
in the Machine constructor despite no hooks being registered, causing an
unnecessary edges_between lookup on every plain transition. Changed both to
false and updated transition_impl to also check _has_post_transition_hooks
when determining trans_type, so posthooks still fire correctly.

histograph() called ar.sort() which mutates the caller's array. Changed to
[...ar].sort() to avoid the side effect.

Fixes stonecypher/fsl#1320, stonecypher/fsl#1321

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