KIP-588 — Allow producers to recover gracefully from transaction timeouts

Accepted TransactionsProducer

Adds a TRANSACTION_TIMED_OUT error code returned when a producer's transaction times out, allowing the same producer instance to recover by re-initializing with the bumped epoch via InitProducerId rather than requiring the application to create a new producer. Previously, a timed-out transaction surfaced as a fatal ProducerFencedException indistinguishable from being fenced by a competing producer, forcing unnecessary producer reconstruction.

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