Display stats on how many times each inspection was trigerred

We actually already count this information:

https://github.com/kowainik/stan/blob/ff2963b8e409de0bf0f0fb0d8418bdf9fcd313b3/src/Stan/Analysis/Summary.hs#L34-L35

We need to come up with the output design and display this information in the output eventually.

Start with src/Stan/Analysis/Summary.hs at the referenced lines to inspect how inspection counts are already represented. Review the existing output design and determine a format for displaying each inspection's trigger count; done means the chosen output includes these statistics.

Written by the indexing model from the issue text.