feat: Add FeedbackProcessingError for feedback handling

- Add custom exception for feedback processing errors
- Add proper error inheritance and docstrings
- Make exception importable via __init__.py

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

src/crewai/utilities/exceptions/__init__.py

@@ -0,0 +1,5 @@
+"""Exceptions module for CrewAI."""
+
+from .feedback_processing_exception import FeedbackProcessingError
+
+__all__ = ["FeedbackProcessingError"]

src/crewai/utilities/exceptions/feedback_processing_exception.py

@@ -0,0 +1,8 @@
+from typing import Optional
+
+
+class FeedbackProcessingError(Exception):
+    """Exception raised when feedback processing fails."""
+    def __init__(self, message: str, original_error: Optional[Exception] = None):
+        self.original_error = original_error
+        super().__init__(message)