Add a PI Analysis Service performance counter to track stopped analyses

The PI Analysis Service has performance counters to track the number of running analyses and the number of suspended analyses, but there is not one that tracks the number of stopped analyses. Currently, the only way to monitor how many AF analyses have a status of 'Stopped' is by writing a custom app that uses the AFSDK's AFAnalysisService.QueryRuntimeInformation Method which is cumbersome.