Implement Duration & Response Time Tracking in AG2Adapter

[aviralgarg05]

Description

In src/agentunit/adapters/autogen_ag2.py:

• ScenarioRun duration is hardcoded to 0.0 (line 321).
• average_response_time metric is hardcoded to 0.0 (line 350).

Source

https://github.com/aviralgarg05/agentunit/blob/main/src/agentunit/adapters/autogen_ag2.py

Task

• Implement proper duration tracking for ScenarioRun.
• Implement logic to calculate average_response_time based on message timestamps.