Add bounded batch lookups for message history - #33902
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## What changed - Add a public cursor-based API that reads history entries newest-first from an absolute offset. - Bound batches to 128 rows and 64 KiB while allowing a single oversized row so pagination always makes progress. - Reuse validated byte positions for unchanged, uncapped histories, and fall back to offset scans when files are rewritten or capped. - Preserve offsets for malformed rows and return them without parsed entries. ## Testing Add coverage for pagination, row and byte limits, oversized and malformed rows, file rewrites, capped-history trimming, appends, and log identity changes. GitOrigin-RevId: 57e52a4ac150cd15a5bdc3fef8a351a1f2eb0e3c
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Add bounded batch lookups for message history
What changed
Testing
Add coverage for pagination, row and byte limits, oversized and malformed rows, file rewrites, capped-history trimming, appends, and log identity changes.