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Performance Boost in GreptimeDB: 10x Speedup with Rust PR

GreptimeDB achieves performance boost for Prometheus protocol with Rust PR.

GreptimeDB can serve as a remote read backend for Prometheus. The recent update optimizes the conversion of columnar RecordBatches produced by the query engine into row-oriented TimeSeries for the Prometheus protocol. This change significantly reduces CPU usage, achieving a performance improvement of over 10 times.