KIP-1214 — Change log.segment.bytes configuration type from int to long to support segments larger than 2GB

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Changes the type of `log.segment.bytes` from `int` to `long` to allow log segments larger than 2 GB. Modern high-capacity servers (e.g., EPYC nodes with 15 TB drives per disk) create disproportionately large numbers of segment files at the 2 GB limit, wasting file descriptors and increasing I/O overhead from frequent segment rotations.

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