KIP-629 — Use racially neutral terms in our codebase

Accepted Kafka 2.7 Admin

Replaces racially charged terminology (`blacklist`/`whitelist`) throughout the Kafka codebase and configuration with neutral alternatives (`block`/`allow` or `deny`/`permit`). Several broker and Connect configurations (e.g., `metric.reporters`, topic creation allowlists) used these terms, which are now renamed with backward-compatible aliases.

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