KIP-278 — Add version option to Kafka's commands

Accepted Kafka 2.0 Admin

Adds a --version flag to all Kafka CLI tools (kafka-topics.sh, kafka-console-producer.sh, etc.) that prints the tool's version string and exits. There was no standard way to determine which Kafka version a CLI binary corresponded to, making it difficult to diagnose version mismatches in mixed-version deployments or when tools are copied to remote hosts.

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