Important

Add /internal/workflow-evaluations/run-statistics endpoint and refactor Wilson confidence interval calculation into statistics_util.rs.

• Behavior:
  • Added /internal/workflow-evaluations/run-statistics endpoint for aggregated workflow evaluation run statistics.
  • Supports optional filtering by metric_name.
• Refactoring:
  • Moved wilson_confint and related functions to statistics_util.rs.
  • Updated imports in evaluations/src/lib.rs and evaluations/src/stats.rs to use new statistics_util module.
• Models:
  • Added WorkflowEvaluationRunStatisticsRow and WorkflowEvaluationRunStatisticsRaw structs in workflow_evaluation_queries.rs.
  • Added TypeScript types WorkflowEvaluationRunStatistics and GetWorkflowEvaluationRunStatisticsResponse.
• Tests:
  • Added tests for new endpoint in get_run_statistics.rs and workflow_evaluation_queries.rs.
  • Updated e2e tests in workflow_evaluation_queries.rs to cover new functionality.
• UI:
  • Updated UI components to use new endpoint for displaying evaluation statistics.

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