KIP-433 — Block old clients on brokers

Discussion BrokerProtocol

Adds min/max API version enforcement per listener to the broker, allowing operators to block connections from clients using API versions below a configured minimum. Very old clients (Kafka 0.8/0.9/0.10) remain wire-compatible with modern brokers but exhibit bugs when they encounter features like record headers; operators need a hard block mechanism to force client upgrades.

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