KIP-656 — MirrorMaker2 Exactly-once Semantics

Discussion Kafka 3.5 MirrorMakerTransactions

Adds an optional exactly-once semantics (EOS) mode to MirrorMaker 2 by implementing a `MirrorSinkTask` that manages consumer offsets transactionally, ensuring each record is delivered to the target cluster exactly once. MirrorMaker 2 is built on Kafka Connect's source connector framework, which provides only at-least-once delivery, meaning duplicate records can be produced to target clusters on task restarts.

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