KIP-144 — Exponential backoff for broker reconnect attempts

Accepted Kafka 1.0 Client

Adds a reconnect.backoff.max.ms configuration to all Kafka clients, enabling exponential backoff with ±20% jitter on broker reconnect attempts, capped at the new maximum. The existing constant reconnect.backoff.ms (default 100ms) caused connection storms against brokers that were down for extended periods.

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