Add a Route to Display SLURM Limits

[alexandermichels]

The Core has default SLURM limits (see here), but these are opaque and not available to the users. We should add a public route to check out the SLURM limits, which could be as simple as returning the dictionary:

var defaultSlurmCeiling = {
      num_of_node: 50,
      num_of_task: 50,
      cpu_per_task: 50,
      memory_per_cpu: "10G",
      memory_per_gpu: "10G",
      memory: "50G",
      gpus: 20,
      gpus_per_node: 20,
      gpus_per_socket: 20,
      gpus_per_task: 20,
      time: "10:00:00",
    };

https://github.com/cybergis/cybergis-compute-core/blob/v2/src/lib/JobUtil.ts#L210