Better agent execution error handling (#54)

A few quality of life improvements around cache handling and repeated tool usage

crewai/agents/cache/cache_hit.py

@@ -0,0 +1,14 @@
+from langchain_core.agents import AgentAction
+from pydantic.v1 import BaseModel, Field
+
+from .cache_handler import CacheHandler
+
+
+class CacheHit(BaseModel):
+    """Cache Hit Object."""
+
+    class Config:
+        arbitrary_types_allowed = True
+
+    action: AgentAction = Field(description="Action taken")
+    cache: CacheHandler = Field(description="Cache Handler for the tool")