Add Agent and Task imports to fix type checker errors

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

src/crewai/project/crew_base.py

@@ -3,6 +3,9 @@ import logging
 from pathlib import Path
 from typing import Any, Callable, Dict, List, TypeVar, cast
 
+from crewai.agent import Agent
+from crewai.task import Task
+
 import yaml
 from dotenv import load_dotenv