KIP-1003 — Signal next segment when remote fetching

Discussion Tiered Storage

Extends RemoteStorageManager#fetchLogSegment with an optional nextRemoteLogSegmentMetadata parameter, allowing RSM implementations to begin pre-fetching the next segment before the current one is fully consumed. Without segment boundary signaling, RSM pre-fetching was limited to within the current segment, causing latency spikes at segment transitions during sequential remote reads.

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