Add srun_args parameter to submitit launcher

[Queuecumber]

Motivation

I needed to pass some extra parameters to srun, submitit can do this but the argument wasn't exposed by the hydra launcher

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Verified on a live slurm cluster

Related Issues and PRs

#2429

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[Jasha10]

Thanks!

[Queuecumber]

Do you need me to do anything for this?

[Jasha10]

No. Thanks very much @Queuecumber!