Important

Adds a new internal API endpoint to fetch the latest feedback ID by metric for a given target, with corresponding database query, handler, client updates, and tests.

• New Endpoint:
  • Adds /internal/feedback/{target_id}/latest-id-by-metric to internal.rs for fetching latest feedback ID by metric.
• Database:
  • Implements build_latest_feedback_id_by_metric_query() in feedback.rs to construct SQL query.
  • Adds query_latest_feedback_id_by_metric() to FeedbackQueries trait in feedback.rs.
• Handlers:
  • Adds get_latest_feedback_id_by_metric_handler() in latest_feedback_by_metric.rs.
  • Implements core logic in get_latest_feedback_id_by_metric() in latest_feedback_by_metric.rs.
• Client:
  • Updates TensorZeroClient in tensorzero.ts to include getLatestFeedbackIdByMetric().
• Tests:
  • Adds unit tests in latest_feedback_by_metric.rs.
  • Adds E2E tests in feedback.rs to verify endpoint behavior.
• Misc:
  • Removes queryLatestFeedbackIdByMetric from feedback.ts and updates related imports.

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