Important

Add RunTopKEvaluationTool for top-k variant evaluation in embedded mode with comprehensive client integration and testing.

• Behavior:
  • Adds RunTopKEvaluationTool to lib.rs and mod.rs for top-k variant evaluation.
  • Implements RunTopKEvaluationTool in run_topk_evaluation.rs using adaptive evaluation with betting-style confidence sequences.
  • Only supports embedded mode; no HTTP endpoint available.
• Client Integration:
  • Extends TensorZeroClient in client_ext.rs and embedded.rs to support run_topk_evaluation().
  • Adds RunTopKEvaluationParams and RunTopKEvaluationResponse to mod.rs.
• Testing:
  • Adds integration tests in run_topk_evaluation_tool.rs for various scenarios including basic execution, error handling, and edge cases like dataset exhaustion.
  • Mocks run_topk_evaluation in common/mod.rs and integration.rs for testing purposes.

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