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Lazy-allocate ParamScopeTracker's identity hashes (#2753)

ParamScopeTracker eagerly built two {}.compare_by_identity hashes in its
constructor, so every validating request allocated both even though many
validators (presence, coercion of flat params) never touch either tracker.

Replace the eager initialize with memoized private accessors that allocate
each hash on first use. Behaviour is unchanged: reads still return nil /
EMPTY_PARAMS when nothing was stored.

In a mixed-endpoint memory_profiler run this drops the two allocation sites
from ~1,900 to ~500 objects each (~0.72 MB / ~2,800 fewer objects overall).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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