KIP-1009 — Add Broker-level Throttle Configurations

Discussion BrokerAdmin

Adds broker-level throttle configurations (`replication.quota.throttled.rate`) that apply globally across all partitions undergoing replication catch-up or reassignment, without requiring per-topic quota configuration. Without global replication throttles, large-scale rebalances or broker recoveries saturate inter-broker bandwidth and spike producer latency.

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