feat: join session rooms for reconnectivity

[omgate234]

Pull Request

Description:
This PR handles the session reconnection update from VideoDB Director

Previous experience

• When the frontend used to connection to the backend via the socketio connection, socketio used to assign a unique internal Session ID, which helps backend track which client to send the message
• Problem: If the client reloads the page, closes the tab accidentally, loses connection, or simply checks the currently running agent invocation on a different device, the user will not be able to see the live updates. This is crucial for long running tasks

Changes:

• Adds join_session message handling and requests to allow joining a message room which maintains the conversation between FE and BE

Related Issues:

Testing:

Checklist:

• Code follows project coding standards
• Tests have been added or updated
• Code Review
• Manual test after merge
• All checks passed