Implement helper class for arrays of counters

Similar to what was already provided for Histograms. Allows easy declaration of arrays of counters.

Note that there are no real changes to the histogram array part, only more documentation and drop of unused code in the testing part

mentioned in merge request lhcb/LHCb!4160 (merged)

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• 2e0117b6...a83ccd67 - 11 commits from branch master
• 08d086c6 - Implement helper class for arrays of counters

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• 7e3e87d9 - Implement helper class for arrays of counters

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assigned to @clemenci

added lhcb-gaudi-head label

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changed milestone to %v37r0

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• [2023-09-12 00:03] Validation started with lhcb-gaudi-head#3680
• [2023-09-12 00:20] Validation started with lhcb-run2-gaudi-head#610
• [2023-09-12 00:26] Validation started with lhcb-sim10-gaudi-head#377
• [2023-09-12 07:25] Validation started with lhcb-gaudi-head#3681

approved this merge request

merged

mentioned in commit b3caecf0