Implement BDN benchmarks vs plain client

この issue には説明がありません。

The issue names only BDN benchmarks and a comparison with the plain client; it does not identify files, tests, or an entry point. Start by locating any existing BenchmarkDotNet setup in the repository and determine how the Entity Framework Core provider and plain ClickHouse client are invoked. Done should be defined by maintainers as a runnable comparison with recorded results.

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