Track external accumulators in tracer instead of using SparkInfo values#10553

charlesmyu wants to merge 2 commits intomasterDataDog/dd-trace-java:masterfrom

charles.yu/djm-0000/fix-spark-plan-metricsDataDog/dd-trace-java:charles.yu/djm-0000/fix-spark-plan-metricsCopy head branch name to clipboard