KIP-1370 — Include Instance and Rack IDs in kafka-streams-groups.sh Member Output

Discussion StreamsAdmin

Adds GROUP-INSTANCE-ID and RACK-ID columns to `kafka-streams-groups.sh --describe --members`, showing the instance ID whenever any member has one and the rack ID only under `--verbose`. Both fields are already returned by StreamsGroupDescribe and the Admin API but were never printed, leaving no way to map generated member IDs to application instances or to diagnose static membership and rack-aware task placement.

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