KIP-1359 — Improve usability of resetting group offsets

Discussion AdminConsumer

Adds a dedicated --export-offsets option to kafka-consumer-groups.sh, kafka-share-groups.sh, and kafka-streams-groups.sh that captures group offsets to CSV without mutating them, and extends the Admin API so the dry-run reset can validate the group type. Exporting offsets today requires --reset-offsets --export --dry-run, where dropping --dry-run silently resets the source group, and a dry run against a group ID of the wrong type succeeds only for the real execution to fail.

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