Expand huge_cache_fuzz to cover additional HugeCache operations and accounting invariants: - #962
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…nd accounting invariants: - Verify `ReleaseCachedPages(n)` size accounting (`cache.size() + released == previous_size`). - Verify `ReleaseUnbacked` returns `r.len` and preserves `cache.size()`. - Exercise `AdvanceClock` with simulated durations to trigger demand-based cache shrinking (`MaybeGrowCacheLimit` / `EnsureLimit`). - Verify `AddSpanStats`, `Print`, and `PrintInPbtxt` consistency (`cache.size().in_bytes() + cache.unbacked_released_bytes() == total_mapped`). PiperOrigin-RevId: 982894884
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huge_cache_fuzzto cover additionalHugeCacheoperations and accounting invariants:ReleaseCachedPages(n)size accounting (cache.size() + released == previous_size).ReleaseUnbackedreturnsr.lenand preservescache.size().AdvanceClockwith simulated durations to trigger demand-based cache shrinking (MaybeGrowCacheLimit/EnsureLimit).AddSpanStats,Print, andPrintInPbtxtconsistency (cache.size().in_bytes() + cache.unbacked_released_bytes() == total_mapped).