KIP-1339 — Make KafkaConfigBackingStore read_write_total_timeout configurable

Discussion Connect

Adds the Kafka Connect DistributedConfig property config.storage.kafka.store.read.write.total.timeout.ms (default 30000) so operators can tune KafkaConfigBackingStore's synchronous write-then-read-back timeout instead of relying on the hardcoded READ_WRITE_TOTAL_TIMEOUT_MS constant. The fixed 30-second bound causes ConnectException on high-load or unstable-network clusters and on workers replaying a large compacted single-partition config topic for thousands of connector tasks.

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