Make it possible to use slurm job submission and control on cluster which do not make sacct user-accessible

[hejung]

I recently learned that there are some (weirdly configured) clusters on which users do not have access to sacct and each sacct call will fail. I am not sure how common this is (and I do not understand the necessity that leads cluster admins to this sort of configs), but we should be able to also write a version of the asyncmd.slurm.SlurmProcess that uses scontrol to check for the running jobs.

This version will probably less performant and it will unfortunately not be able to parse all exit codes that slurm logs as scontrol only works for running jobs and only the database accessible through sacct keeps track of all expired jobs (successful and failed). It should therefore only be enabled via a configuration function (asyncmd.config.enable_slurm_scontrol_job_parsing or similar) and live parallel to the sacct implementation.