Add Conversation Coherence evaluator#4959
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This PR upgrades the coherence evaluator to support conversation-level evaluation (not just single-turn), aligned with the recent output schema updates.
It adds a dedicated multi-turn prompty with explicit skip-gating rules, standardizes multi-turn outputs (coherence, coherence_score, coherence_result, coherence_status, coherence_reason,
coherence_properties), uses MessagesOrQueryResponseInputValidator for messages/query+response input handling, and includes concrete examples for skip behavior and each coherence level (1–5).
Quality is tested and verified to be accurate and reliable. link to report