fix: change group name and extend CumulativeSum in ThroughputMetricsReporter #9211
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This PR contains two fixes:
ksql-query-throughput-metricsso that we can distinguish them from the Streams metrics they are derived fromThroughputTotalMetricextend the Kafka metrics classCumulativeSumso that the ce-kafka metrics reporter we integrate with will know to compute the diff and only forward the throughput deltas (see here). This is a bit of a hack but it's necessary to ensure that the downstream metrics processing will accumulate the totals correctly.