KIP-175 — Additional '--describe' views for ConsumerGroupCommand

Accepted Kafka 1.1 AdminConsumer

Extends kafka-consumer-groups.sh --describe with additional flags: --members (show group members and their assignments), --offsets (show committed offsets and lag), and --state (show high-level group state). The original single-view output mixed members without assignments and partitions without consumers, producing confusing tables with many empty columns for large groups.

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