KIP-1189 — Allow custom topic configurations for RemoteStorageManager

Discussion Tiered Storage

Enables RemoteStorageManager (RSM) plugins to declare custom per-topic configuration properties and have the broker forward those topic-level configs to the RSM at runtime. The broker currently forwards only broker-level configs prefixed with rsm.config to the RSM, with no mechanism for RSM plugins to express or receive topic-level configuration overrides (e.g., different remote storage buckets per topic).

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