KIP-108 — Create Topic Policy

Accepted Kafka 1.0 AdminBroker

KIP-108 introduces a `CreateTopicPolicy` plugin interface that brokers invoke before creating a topic, allowing administrators to enforce naming conventions, minimum replication factors, partition counts, or other cluster-specific constraints. Without this policy hook, `AdminClient.createTopics()` and auto-topic creation bypass all administrative controls, making it impossible to enforce governance rules without ZooKeeper-level intervention.

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