KIP-1021 — Allow to get last stable offset (LSO) in kafka-get-offsets.sh

Discussion AdminConsumer

Adds an --isolation flag to kafka-get-offsets.sh and extends OffsetSpec with an LSOSpec so that the last stable offset (LSO) can be fetched instead of the high watermark. Without this, the tool always uses IsolationLevel.READ_UNCOMMITTED, making it impossible to observe the true consumer-visible offset boundary for transactional topics.

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