feat(scan): incremental append scan - #2997
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Add IncrementalAppendScanBuilder to read files appended between two snapshots. Rows written under an older schema in the range are projected onto the table's current schema (newer columns become NULL), matching the Java and PyIceberg implementations. Refactors the shared table-scan build logic into build_table_scan / ScanConfig so it can be reused by both the standard and incremental scan builders.
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Which issue does this PR close?
What changes are included in this PR?
Add IncrementalAppendScanBuilder to read files appended between two snapshots. Rows written under an older schema in the range are projected onto the table's current schema (newer columns become NULL), matching the Java and PyIceberg implementations.
Refactors the shared table-scan build logic into build_table_scan / ScanConfig so it can be reused by both the standard and incremental scan builders.
Are these changes tested?
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