[Core] Add predicate deletes to TableUpdate

[JingsongLi]

Purpose

PyPaimon already supports delete_by_predicate, but native updates expose only row-ID deletion. Python still reads partition manifests or materializes matched row IDs before invoking Rust. Move that complete existing operation into Rust core.

Changes

• Add TableUpdate::delete_by_predicate, with batch and stream Python wrappers and updated type stubs.
• For partition-only predicates, prepare deletion messages for all active data and index files in the selected partitions. This supports append, primary-key and data-evolution tables, including pending bucket -2 files, without requiring deletion vectors.
• For other predicates, stream matched row IDs into the existing data-evolution deletion-vector writer. Match reading and DV preparation share one captured snapshot; FULL scalar-index mode includes unindexed appends.
• Extract the committer's existing complete snapshot-manifest reader for shared internal use. No new public scan abstraction or dependency is introduced.
• Validate authorization, time travel and predicate field/schema consistency before reading metadata. Publication remains the caller's responsibility.

Java semantics

Reuse Java-compatible commit-message baselines, anchor selection and DV replacement checks. Default file/DV/row-ID conflict detection preserves later appends with fresh row IDs and rejects conflicting replacements. Java's stricter partition-level checker is configured separately through an explicit last-safe snapshot; a message baseline alone does not enable it. The paired Python change removes its extra coarse partition check.

Verification

• Reproduced the missing native method with a binding test before implementation.
• 53 focused core update/delete tests passed, including 11 new predicate-delete tests.
• 121 core commit tests passed.
• 21 binding update/delete tests passed.
• Paired PyPaimon integration: 756 related Native tests plus 2 additional REST snapshot tests passed; final predicate suite 30 passed.
• cargo +1.98.0 clippy -p paimon -p pypaimon_rust --all-targets -- -D warnings and cargo fmt --all --check passed.
• Independent core and wrapper/Java-semantics reviews found no blocking issues.

Paired PyPaimon adapter and Java-semantics alignment: apache/paimon#10507.

[QuakeWang]

+1

[leaves12138]

Reviewed the Rust core and Python binding changes. Predicate deletes capture one snapshot, correctly separate partition metadata deletion from row-level deletion-vector preparation, include pending/index files, and preserve conflict baselines. The focused tests and all Rust CI checks pass. No blocking issues found.