KIP-1291 — Extended I/O Metrics Collection

Accepted Kafka 4.4 MetricsBroker

Exposes all 7 Linux /proc/self/io metrics on Kafka brokers (rchar, wchar, syscr, syscw, read_bytes, write_bytes, cancelled_write_bytes) instead of just the current 2 (read_bytes, write_bytes). The missing 5 metrics are essential for distinguishing cached vs. physical I/O, diagnosing syscall overhead, and understanding write cancellations—critical for tuning Kafka's I/O-intensive workloads.

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