Updated Trace class

- Updated get_last_experiment_info(), a very useful function that returns the information of last experiment (to be used in feedback generation).

rdagent/core/proposal.py

@@ -54,6 +54,14 @@ class Trace(Generic[ASpecificScen]):
         self.scen: ASpecificScen = scen
         self.hist: list[Tuple[Hypothesis, Experiment, HypothesisFeedback]] = []
 
+    def get_last_experiment_info(self) -> Tuple[Hypothesis, ASpecificTask, Any]:
+        """Access the last experiment result, sub-task, and the corresponding hypothesis."""
+        if not self.hist:
+            return None
+        last_hypothesis, last_experiment, _ = self.hist[-1]
+        last_task = last_experiment.sub_tasks[-1]
+        last_result = last_experiment.result
+        return last_hypothesis, last_task, last_result
 
 class HypothesisGen:
     def __init__(self, scen: Scenario):