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Implementation of BlockProcessor for OTel metrics (Sum / Gauge → measures)
BlockProcessor for OTLP ResourceMetrics payloads → measures rows.
Handles Sum and Gauge data points; logs and skips Histogram, ExponentialHistogram,
and Summary (deferred to v2 — see plan §“Histograms deferred”). Aggregation
temporality and is_monotonic ride along on per-row properties.