JunRuiLee opened a new pull request, #7807:
URL: https://github.com/apache/paimon/pull/7807
### Purpose
Part 1/3 of https://github.com/apache/paimon/issues/7806
Add the infrastructure for snapshot-based sequence ordering:
- Reserve `_COMMIT_SNAPSHOT_ID` special field and add `snapshotId`
attribute on `KeyValue`.
- Add nullable `commitSnapshotId` field to `DataFileMeta` with
builder-based copy methods.
- Bump `DataSplit` version 8→9 and `CommitMessageSerializer` version 11→12
with legacy serializer for backward-compatible deserialization.
Pure plumbing — no behavior change. The field is always null until the
write-path PR stamps it.
### Tests
- `DataFileMetaCommitSnapshotIdTest`: field default null, assign/preserve
across copy methods, serializer round-trip.
- `DataFileMetaSerializerCompatibilityTest`: legacy 20-field serialize →
deserialize produces `commitSnapshotId == null`.
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