Retryable options and integration with autometric

crew.cluster 0.3.3

• Add slurm_memory_gigabytes_required to set --mem in SLURM (#44, @multimeric).
• Add r_arguments to accept R command line arguments for workers.
• Support options_metrics.
• Organize arguments into options lists.
• Use crashes_error from crew.
• Implement retryable options for memory, cores, GPUs, wall time, and SLURM partition (#48, @stemangiola).
• Set default seconds_idle to 300.