[exporter] expand all slurm arrays

[abhinavDhulipala]

slurm arrays that are pending show up as one line. The -r option removes this optimization. Eventually, we can support parsing the array string, but there is quite a bit to the format and after a couple preliminary perf tests, the scrape duration seems unaffected. Will do some more perf testing before merging and will publish the dashboard pre and post change

[abhinavDhulipala]

The -r command doesn't seem to work with the json command. I'm switching the cli fallback to the default mode of operation for now until we get to supporting the array string.

[abhinavDhulipala]

So memory usage spiked by about 3X:

Our steady state before averaged 20 Mb, we now average 60 Mb on the heap and our max spiked from 60Mb to 125 Mb , respectively. This is undoubtedly high, but it's warranted for the sake of accuracy.

@kbroch-rivosinc Thoughts?

[abhinavDhulipala]

Tagging and releasing