KIP-874 — TopicRoundRobinAssignor

Discussion Consumer

Proposes a `TopicRoundRobinAssignor` that distributes partitions so each consumer in a group receives all partitions of a given topic (round-robin at the topic level rather than partition level). The existing `RoundRobinAssignor` interleaves partitions across topics for balance, but use cases requiring all-or-nothing consumption of a topic (for consistency guarantees) cannot be satisfied without a custom assignor.

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