KIP-23 — Add JSON/CSV output and looping options to ConsumerGroupCommand

Discussion AdminConsumer

KIP-23 adds `--output-format` (csv/json) and `--loop`/`--num-iterations` options to `kafka-consumer-groups.sh`, enabling machine-readable output and continuous polling without scripting wrappers. This addresses the lack of structured output and interactive monitoring support in the consumer group command-line tool.

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