Adding Autocomplete to OSS (#1198)

* Cleaned up model_config

* Fix pydantic issues

* 99% done with autocomplete

* fixed test issues

* Fix type checking issues

src/crewai/agents/cache/cache_handler.py

@@ -1,13 +1,12 @@
-from typing import Optional
+from typing import Any, Dict, Optional
+
+from pydantic import BaseModel, PrivateAttr
 
 
-class CacheHandler:
+class CacheHandler(BaseModel):
     """Callback handler for tool usage."""
 
-    _cache: dict = {}
-
-    def __init__(self):
-        self._cache = {}
+    _cache: Dict[str, Any] = PrivateAttr(default_factory=dict)
 
     def add(self, tool, input, output):
         self._cache[f"{tool}-{input}"] = output