Enable a mode with a gradual

Why it matters

This feature enables users to simulate and measure ClickHouse performance under increasing concurrency levels within a single benchmark run. It helps in understanding how the system behaves as the number of parallel queries grows, allowing better tuning and resource allocation.

How to use it

Use the clickhouse-benchmark tool with the --max-concurrency option followed by the desired maximum number of parallel queries. The tool will then incrementally increase concurrency up to this maximum during the benchmark execution.