KIP-1239 — Batch offset translation in RemoteClusterUtils

Accepted Kafka 4.3 MirrorMakerConsumer

Adds a batch overload to RemoteClusterUtils.translateOffsets() that accepts multiple consumer groups and translates their offsets in a single pass over the MirrorCheckpointConnector checkpoints topic. The existing single-group method fully scans the checkpoints topic per call, making mass offset translation during disaster recovery or manual failover prohibitively slow for environments with many consumer groups.

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