Merge slurm deskew with mantis deskew CLI call

[ieivanov]

Currently the mantis deskew CLI call processes positions consecutively. We can process positions in parallel using slurm by calling a python script: python slurm_deskew.py, after we modify the script with the right dataset parameters. It would be convenient to merge the two pipelines and add an optional --use_slurm flag to mantis deskew, e.g.

mantis deskew /input_path /deskew_params_path -o /output_path --use_slurm

with optional parameters such as --cpus_per_task or --mem_per_cpu.

Based on our discussion this morning, processing datasets with slurm is not fool-proof enough to be abstracted as a CLI call. At this point calling a python script is the more appropriate format. We decided to revisit that after more experience with running parallel slurm jobs.

[talonchandler]

After discussion, @edyoshikun and I agree that this is not on the immediate critical path. We're planning to continue using slurmkit scripts for our analyses.