eve/stats: allow hiding counters whose value is 0
Our stats event can have a big number of counters that will be zero.
We want to offer the ability to hide such counters, to improve readability.
This can be a bit trickier as there are:
- counters that are 0 because they're not in use
- counters that are 0 because... they were not incremented.
We should probably reach out to users before deciding on an approach for this one.
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