Draft: Save HLT2 counters in JSON files

Kate Abigail Richardsonrequested to merge
kaaricha_counters_histos into master

The goal of this MR is to save the HLT2 counters into JSON files which can be managed similarly to how the histograms are dealt with currently for storage.

Also needs MooreOnline!628

Edited by Kate Abigail Richardson

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