Add a way to know when an async poulpy request has finished

For example, in my case, I'm using : poulpy retry-last-submissions ... to generate a new trace with the last version of the moulinette for every student. It will launch at least 600 new jobs on MaaS, and I have no other way to know if it's done other than looking at the MaaS grafana, which could take between 10 and 40 min.

It will be nice to have a query on poulpy to check if the job is done or not, that we can query every minute or so to launch the rest of the pipeline.

the poulpy retry-last-submissions should return a jobID that we can query with poulpy check-job-status (or something like that).

Thanks a lot for all the works <3