Add support for snakemake --batch parameter

[holtgrewe]

Is your feature request related to a problem? Please describe.
Running snappy-snake on large workflows is hard. Snakemake offers --batch for this.

Describe the solution you'd like
Pass this through from snappy-snake to snakemake.

Also, adjust the pipeline_job.sh template such that it can be submitted easily with sbatch --array=START-STOP. This should lead to adding --batch default=$SLURM_ARRAY_TASK_ID/$SLURM_ARRAY_TASK_MAX to the script and terminate the script if $SLURM_ARRAY_TASK_ID < 1. This will allow submitting with sbatch --array 1-10 pipeline.sh` and work through the large workflow in 10 batches.

Describe alternatives you've considered
N/A

Additional context
N/A