fix: restore typing imports to resolve F821 undefined name errors

- Add back Dict, List, Tuple, Type imports that are used throughout the code
- Consolidate duplicate imports in llm.py
- Match existing codebase patterns for type annotations
- Maintain quota limit handling functionality while fixing CI issues

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

src/crewai/agent.py

@@ -3,11 +3,14 @@ import subprocess
 import time
 from typing import (
     Any,
+    Dict,
+    List,
     Literal,
     Optional,
+    Tuple,
+    Type,
     Union,
 )
-from typing import Dict, List, Tuple, Type
 from collections.abc import Callable, Sequence
 
 from pydantic import Field, InstanceOf, PrivateAttr, model_validator

src/crewai/agents/crew_agent_executor.py

@@ -1,5 +1,4 @@
-from typing import Any, Optional, Union
-from typing import Dict, List
+from typing import Any, Dict, List, Optional, Union
 from collections.abc import Callable
 
 from crewai.agents.agent_builder.base_agent import BaseAgent

src/crewai/llm.py

@@ -8,13 +8,16 @@ from collections import defaultdict
 from contextlib import contextmanager
 from typing import (
     Any,
+    DefaultDict,
+    Dict,
+    List,
     Literal,
     Optional,
+    Type,
     TypedDict,
     Union,
     cast,
 )
-from typing import DefaultDict, Dict, List, Type
 from datetime import datetime
 from dotenv import load_dotenv
 from litellm.types.utils import ChatCompletionDeltaToolCall