feat: support input changelog for primary key writes

[QuakeWang]

Purpose

Linked issue: close #255

This PR supports changelog-producer=input for primary-key table writes in the scoped Rust write path.

The implementation double-writes primary-key input rows into changelog files while keeping normal table data files deduplicated, then commits changelog files through separate changelog manifest metadata.

Brief change log

• Add typed parsing for changelog-producer and changelog file options in CoreOptions.
• Add PreparedFiles and propagate changelog files separately from normal data files.
• Teach KeyValueFileWriter to write input changelog files from the full sorted input rows, while normal data files still use merge-engine selected rows.
• Compute changelog DataFileMeta from changelog rows, including row count, key stats, sequence range, and retract row count.
• Add CommitMessage::new_changelog_files and commit changelog entries into a separate changelog manifest list.
• Populate snapshot changelogManifestList and changelogRecordCount.
• Reject unsupported combinations early, including non-PK tables, non-deduplicate merge engines, cross-partition dynamic bucket, bucket=-2, rowkind.field, unsupported changelog producers, and overwrite with changelog files.
• Preserve existing normal data manifest, index manifest, and table record count behavior.

Tests

• cargo fmt --all -- --check
• cargo clippy -p paimon --all-targets -- -D warnings
• cargo test -p paimon changelog
• cargo test -p paimon

API and Format

Documentation