Major Description
A single Kafka Streams instance can include multiple stream threads, and hence without logging prefix it is difficult to determine which thread's producing which log entries.
We should
1) add the log-prefix as thread id in StreamThread logger, as well as its contained StreamPartitionAssignor.
2) add the log-prefix as task id in StreamTask / StandbyTask, as well as its contained RecordCollector and ProcessorStateManager.
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