Create the option for Crews to not automatically end_session() after kickoff

[areibman]

🚀 Feature Request

💡 Got a brilliant idea? If you run crew.kickoff() multiple times during the same session, a kickoff() success will automatically run agentops.end_session('Success'). This means the developer loses control of their session.

🎉 Describe the solution you'd like Update crew.kickoff() so that it doesn't automatically end_session. Or make it optional somehow.