KIP-849 — Expose logdirs total and usable space via kafka-log-dirs.sh

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Adds totalBytes and usableBytes fields to every logDirs entry in the kafka-log-dirs.sh JSON output (version 2), exposing log directory disk capacity alongside replica offset data. KIP-827 added this data to the broker API but the CLI tool did not surface it, forcing operators to separately inspect disk usage.

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