Allow per-experiment slurm configuration

[nefrathenrici]

Once ClimaAtmos#2341 is finalized and merged, we can add full GPU support.
This will just require setting proper sbatch arguments for the driver, pipeline.sh. We could do this quickly by adding an additional GPU driver, but I would rather have a unified interface.
I am planning on doing this by introducing a proper command line interface, which will also allow a simpler interface for running experiments.

We will need to :

• determine the correct GPU settings. This will be quick.
• Add an argument parser and change the way the pipeline takes in configurations. This will be the bulk of the work, but won't be too complicated because the pipeline is still quite simple.