KIP-798 — Add possibility to write kafka headers in Kafka Console Producer

Accepted Kafka 3.2 ProducerAdmin

Adds parse.headers=true support to kafka-console-producer.sh's LineMessageReader, with configurable delimiters for header blocks, individual headers, and key-value pairs within a header. The console producer previously had no way to include record headers, limiting its usefulness for testing header-aware consumers and SMTs.

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