Add random delay to nested sbatch submissions

Adds random delay to functions that call sbatch. If those functions are run in simultaneous array tasks, it can overwhelm the scheduler with simultaneous job submissions causing some jobs to fail to submit.

src/rc_gpfs/cli/convert_flat_to_hive.py

 import argparse
 import subprocess
+import time
+import random
 from pathlib import Path
 import polars as pl
 
@@ -76,6 +78,12 @@ def submit_batch(**kwargs):
 
     script = f"#!/bin/bash\n#\n{slurm_opts}\n{BATCH_CMDS.format(**kwargs)}"
 
+    # Wait between 1 and 5 seconds before batch submission. This helps avoid a situation where this setup is running in
+    # a batch array job and all of the array tasks submit their child array jobs at the same time. That results in jobs
+    # failing to be submitted due to overwhelming the scheduler with simultaneous requests. Adding a random delay should
+    # fix that
+    time.sleep(random.uniform(1,5))
+
     subprocess.run(['sbatch'],input=script,shell=True,text=True)
     pass