Improve AgentOps listener type hints and formatting

- Add string type hints for AgentOps classes to resolve potential import issues
- Clean up unnecessary whitespace and improve code indentation
- Simplify initialization and event handling logic

src/crewai/utilities/events/third_party/agentops_listener.py

@@ -18,8 +18,8 @@ except ImportError:
    
 
 class AgentOpsListener(BaseEventListener):
-    tool_event: Optional[agentops.ToolEvent] = None
-    session: Optional[agentops.Session] = None
+    tool_event: Optional["agentops.ToolEvent"] = None
+    session: Optional["agentops.Session"] = None
     
     def __init__(self):
         super().__init__()
@@ -28,8 +28,6 @@ class AgentOpsListener(BaseEventListener):
       if not AGENTOPS_INSTALLED:
         return 
       
-
-              
       @event_bus.on(CrewKickoffStartedEvent)
       def on_crew_kickoff_started(source, event: CrewKickoffStartedEvent):
           self.session = agentops.init()