KAFKA-18026: migrate KStream and KTable aggregates to use ProcesserSupplier#stores #17929
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As part of KIP-1112, to maximize the utility of the new ProcessorWrapper, we need to migrate the DSL operators to the new method of attaching state stores by implementing
ProcessorSupplier#stores, which makes these stores available for inspection by the user's wrapper.This PR covers the aggregate operator for both KStream and KTable.