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Implement HandleClusteredCreateAsync, HandleClusteredUpdateAsync, and HandleClusteredDeleteAsync on StreamApiHandlers, and HandleClusteredCreateAsync and HandleClusteredDeleteAsync on ConsumerApiHandlers. These handlers propose operations to the meta RAFT group (JetStreamMetaGroup) instead of operating on the local StreamManager/ConsumerManager, matching the Go jsClusteredStreamRequest and jsClusteredConsumerRequest patterns (jetstream_cluster.go:7620-8265). Ten tests in ClusteredApiTests.cs verify: stream create proposes to meta group, duplicate-stream error, not-leader error (code 10003), stream update, stream delete, not-found-on-delete, consumer create on stream, consumer-on-missing-stream error, consumer delete, and not-found consumer delete.