enhancement: Add more details when sub-task fails

[kairoaraujo]

What do you want to share with us?

The current API shows the task status.
When a task has the status FAILURE, the status is quite simple. It is a string with the exception message from the task.

The proposal for this issue is an enhancement in case of status FAILURE
The suggestion is

"status": {
    "error": "string with the error message/exception",
    "traceback": "The failure traceback, it can help developers and use troubleshooting in details"
} 

This will improve the existent implementation on the RSTUF Worker repository-service-tuf/repository-service-tuf-worker#190

References

• Enhancement: Improve the task monitoring the sub-task, to have a better update for task repository-service-tuf-worker#190

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