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Add percentage of divergent transitions to convergence flag #21

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@nehill197

Should add divergent transitions as indicator of convergence.

Stan manual suggests a small number of divergent transitions is "often good enough to move forward" if you have good rhat and ess values.

Look into how divergent transitions are tracked within cmdstanr - if any are flagged (regardless of whether or not that sample is one of the thinned samples) it makes more sense to look at as a percentage.

Initial suggestion is < 1% but we should also research to see if there is an accepted %.

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