[Enhancement] Decouple tasks directory

[zephyrzilla]

Summary

This PR decouples the tasks directory from the framework and allows writing tasks/flows within any directory, without explicitly creating a separate tasks directory.

For example:
Allows users to run tasks both using --task examples.agent_simulation and --task tasks.examples.agent_simulation

How to Test the feature

1. Test without prefix (new functionality):

   python main.py --task examples.agent_simulation

   Expected result: Task runs successfully without FileNotFoundError

2. Test with prefix (existing functionality):

   python main.py --task tasks.examples.agent_simulation  

   Expected result: Task runs successfully as before

Checklist

• Lint fixes and unit testing done
• End to end task testing
• Documentation updated

[psriramsnc]

LGTM

[amitsnow]

LGTM