[Feature Request] Allow setting use_srun from submitit launcher

Feature Request

Submitit added a boolean use_srun argument to disable the use of srun since newer versions of slurm make that incompatible.

https://github.com/facebookincubator/submitit/pull/1745

I would like to have that exposed to hydra in the SlurmQueueConf similar to srun_args in #2429