Mutator to turn check status into metric

I spun up a little mutator script today that makes use of jq so check status can be treated as a metric. Very thin little hack, but I thought it might be useful until the golang influx handler grows the ability to do this natively

Really quickly this script will find the check status value in a Sensu Go event and then append it into the metrics points array.

Not supremely configurable, but good enough for anyone interested to take and modify.