chore: add logging for evaluation process

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/utilities/evaluators/crew_evaluator_handler.py

@@ -210,6 +210,7 @@ class CrewEvaluator:
         Raises:
             ValueError: If task to evaluate or task output is missing, or if evaluation result is invalid
         """
+        try:
             current_task = None
             for task in self.crew.tasks:
                 if task.description == task_output.description:
@@ -221,6 +222,7 @@ class CrewEvaluator:
                     "Task to evaluate and task output are required for evaluation"
                 )
 
+            self._logger.log("info", f"Starting evaluation for task: {task_output.description}")
             evaluator_agent = self._evaluator_agent()
             evaluation_task = self._evaluation_task(
                 evaluator_agent, current_task, task_output.raw
@@ -239,5 +241,9 @@ class CrewEvaluator:
                 self.run_execution_times[self.iteration].append(
                     current_task._execution_time
                 )
+                self._logger.log("info", f"Evaluation completed with score: {evaluation_result.pydantic.quality}")
             else:
                 raise ValueError("Evaluation result is not in the expected format")
+        except Exception as e:
+            self._logger.log("error", f"Evaluation failed: {str(e)}")
+            raise