Threshold span count cannot be above sample size

ThresholdLogReporter > updateSet remove items from the set when over the sample size, however when convertThresholdSet builds the JSON to log, the count will be the set size, not the total number of spans that were recorded
eg say 30 spans are reported, when adding to the set via updateSet, once the sampleSize is reached, spans are removed but there isn't a total number of spans that were added, we instead use the set size, which will equal the sample size
https://github.com/couchbase/couchbase-jvm-core/blob/master/src/main/java/com/couchbase/client/core/... <- updateSet
https://github.com/couchbase/couchbase-jvm-core/blob/master/src/main/java/com/couchbase/client/core/... <- convertThresholdSet

Each service set should have a total count that tracks the number of spans that were added to the set, which is not tied to the set size. This count should also be reset during the logging process.