feat(inspect): add system metadata tables - #876
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- Add Scan() virtual method and Scan() convenience overload to MetadataTable - Add SnapshotSelection struct for time-travel snapshot resolution - Add supports_time_travel() concrete method driven by kind() - Implement SnapshotsTable::Scan() to materialize snapshot rows via ArrowRowBuilder
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Codex <codex@openai.com>
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Summary
Add streaming system metadata tables for branches, tags, files, partitions, and manifests.
Changes
Why
This makes Iceberg system metadata available through the C++ metadata-table API, using bounded Arrow batches and behavior aligned with Apache Iceberg's reference implementation.
Impact
Consumers can inspect table references, live files, partition aggregates, and manifest metadata without implementing manifest traversal or Arrow materialization themselves.
Dependency
This branch is based on #801, which provides the metadata-table streaming APIs used here. Because this PR targets
main, its diff includes that prerequisite history until #801 is merged.