Task Queue Redesign

[movchan74]

Summary:
This Pull Request focuses on redesigning the task queue to improve how tasks are managed and executed, specifically by integrating them directly with RequestHandler calls. The update also includes enhancements to task management and testing.

Key Changes:

1. Task Queue Redesign: The task queue now operates directly on RequestHandler calls instead of using asyncio tasks, streamlining task execution.
2. Enhanced Request Handling: The call_endpoint method in RequestHandler has been refactored to execute_task, which now fully handles task execution, including running the endpoint and updating the task status.
3. Task Retry Logic: A num_retries parameter has been added to tasks, allowing for configurable retry attempts.
4. Task Repository Testing: New tests have been added to ensure the reliability and accuracy of the task repository's functionality.

Closes: #166

[HRashidi]

Some comments to be reviewed

[HRashidi]

LGTM 👍🏽