Configurations for which evaluators to apply to the dataset run.
Each can be the string of an
EvaluatorType <langchain.evaluation.schema.EvaluatorType>, such
as EvaluatorType.QA, the evaluator type string ("qa"), or a configuration for a
given evaluator
(e.g.,
RunEvalConfig.QA <langchain.smith.evaluation.config.RunEvalConfig.QA>).
evaluators: list[SINGLE_EVAL_CONFIG_TYPE | CUSTOM_EVALUATOR_TYPE] = Field(default_factory=list)