feat: add serialization support for ReservoirItemsSketch#94

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proost merged 9 commits intoapache:mainfrom

Fengzdadi:feat-reservoir-items-sketch

Jan 14, 2026

Commits on Jan 13, 2026

feat(sampling): align test data with Java PR #714 conditions
Fengzdadi
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fix(sampling): align serialization format with Java for cross-language compatibility
Fengzdadi
committed