KIP-1323 — Initialization of share group offsets from a specific offset or a file

Accepted Kafka 4.4 AdminConsumer

Adds --to-offset and --from-file reset options to kafka-share-groups.sh, letting operators set the share-partition start offset to an explicit value or from a CSV of topic,partition,offset lines (filtering by group ID when the file carries the 4-column consumer-group export format). The share group tool shipped with fewer reset options than kafka-consumer-groups.sh, so migrating a consumer group's committed offsets into a share group was only possible programmatically, not from the CLI.

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