KIP-288 — [DISCARDED] Consumer.poll() timeout semantic change and new waitForAssignment method

Discarded Kafka 2.0 Consumer

Proposed changing `Consumer.poll(long timeout)` semantics so the timeout applies uniformly to all blocking operations within poll, and adding a `waitForAssignment()` method. The existing `poll()` timeout is inconsistently applied — some internal blocking calls (e.g., group coordinator lookup) can block indefinitely regardless of the timeout. (Discarded in favor of KIP-266.)

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