feat: DH-23433: Added barrage client benchmarks

[stanbrub]

Added a barrage client benchmark to standard benchmarks that measures throughput for a two column table (String, double) retrieved via snapshot

[Copilot]

Pull request overview

Adds a standard benchmark measuring Barrage snapshot throughput for a two-column table.

Changes:

• Creates a Barrage client session.
• Benchmarks static snapshot retrieval at scale.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

Suppressed comments (1)

src/it/java/io/deephaven/benchmark/tests/standard/client/BarrageClientTest.java:26

• b's/source' is a scope ticket for the newly opened Barrage session, not for the Bench console session that loaded source. Because these are separate server sessions, the Barrage session has no source variable and this snapshot will fail instead of producing benchmark data. Publish the table under a shared ticket (or otherwise export it into the Barrage session) and snapshot that ticket.

        var q = "result = session.snapshot(b's/source')";