Note

Adds Evaluator.unbind() and updates bind_evaluator to return a deep-copied, bound evaluator instead of mutating the original.

• Evaluators (packages/phoenix-evals/src/phoenix/evals/evaluators.py):
  • Add Evaluator.unbind() to clear any bound input_mapping.
  • Update bind_evaluator to deepcopy the provided evaluator, bind the copy, and return it (prevents mutating the original).
  • Import copy to support deep copying.

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