Important

Introduces a new endpoint to fetch variant performance statistics, with backend, API, and frontend changes, along with comprehensive testing.

• Backend:
  • Added get_variant_performances to FeedbackQueries in feedback.rs.
  • Implemented build_variant_performance_query in feedback.rs for SQL query construction.
  • Added VariantPerformanceRow and GetVariantPerformanceParams structs in feedback.rs.
• API:
  • New endpoint /internal/functions/{function_name}/variant-performances in internal.rs.
  • Handler get_variant_performances_handler in internal.rs.
• Frontend:
  • Added getVariantPerformances method to TensorZeroClient in tensorzero.ts.
  • Updated VariantPerformance component to display performance data.
• Tests:
  • Added unit tests for get_variant_performances in feedback_queries.rs.
  • Added E2E tests for the new endpoint in functions.rs.

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