feat: add reasoning attribute to DSRunnerFeedback for enhanced evaluation context (#1162)

Author: peteryang1

rdagent/scenarios/data_science/dev/runner/eval.py

@@ -37,6 +37,7 @@ class DSRunnerFeedback(CoSTEERSingleFeedback):
     """
 
     acceptable: bool | None = None
+    reasoning: str | None = None
     hyperparameter_tuning_decision: bool | None = None
     hyperparameter_tuning_suggestion: str | None = None
     score: str | None = None