[python] Generate input changelogs from Python writer#7739

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junmuz:adding_changelog_producer

Commits on May 26, 2026

Implementing input changelog generation support in python lib

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Reject changelog-producer on non-PK tables and decouple changelog file format from data file format

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Making the behavior consistent with Java implementation

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Changing position for backward compatibility

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Move changelog-producer validation to Schema constructor to prevent bypass

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Address PR review feedback: pass changelog_producer to DataBlobWriter and remove mutable state coupling

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