KIP-840 — Config file option for MessageReader/MessageFormatter in ConsoleProducer/ConsoleConsumer

Discussion Kafka 3.4 Admin

Adds --reader-config to kafka-console-producer.sh and --formatter-config to kafka-console-consumer.sh, enabling MessageReader/MessageFormatter properties to be supplied via a config file instead of only via repeated --property flags. Complex reader/formatter setups (e.g., Avro with Schema Registry SSL) require many properties, making the command line unwieldy and exposing sensitive values in shell history.

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