feat: option to query and save results from Celery id directly

[ocervell]

Currently, in remote mode, if running a Task, Workflow or Scan, the client has to remain connected to the worker for results to be saved locally on the client side.

So if the connection is broken for unknown reasons, the results are inaccessible.

We should add a way to query / save results at a later time, using the Celery id:

secator x httpx <huge_list_of_urls>
Running in worker with id <CELERY_ID>

and later:

secator reports fetch <CELERY_ID> --save