[python] Delegate predicate deletion to native TableUpdate

[JingsongLi]

Purpose

Use native execution for PyPaimon's existing BatchTableUpdate and StreamTableUpdate.delete_by_predicate. Previously Python still planned partition metadata deletion or collected all matched row IDs before invoking the native row-ID writer.

Depends on apache/paimon-rust#1105. Keep this draft until that PR reaches Rust main; Native CI continues to build upstream main.

Changes

• Delegate the complete predicate-delete operation to Rust core, converting only predicates and commit messages in Python.
• Keep native preparation separate from execution: execution, snapshot-load and message-conversion failures cannot fall back into a second Python operation.
• Share common native update eligibility. Partition-only deletes also use Rust for append/PK tables without row tracking or deletion vectors, including pending bucket -2 files.
• Align Python commit conflict checks with Java: remove the extra partition-level rejection based solely on a message snapshot baseline. Prepared deletes preserve subsequent appends with fresh row IDs; existing file/DV/row-ID checks still reject conflicting replacements and updates.
• Add REST tests for batch/stream operation ownership, partition/data/mixed/NULL predicates, column deltas, prior DV contents, scalar indexes, unindexed rows, pending files, races and snapshot-load errors.

Java semantics

FileStoreCommitImpl.configureRowIdCheckFromMessages configures row-ID checking; it does not enable StrictModeChecker. The stricter checker is constructed only when an explicit last-safe snapshot is configured. DataEvolutionConflictDetection ignores fresh row IDs beyond the baseline and checks overlapping historical row/column writes. Python now follows this default behavior.

Verification

Built the paired Rust extension locally and enabled Native planning, reads, writes and commits:

• 756 related Native regression tests passed; 2 additional REST snapshot tests passed.
• Final predicate-delete suite: 30 passed, including after rebasing onto current master.
• Existing Python update suite: 130 passed plus 20 subtests.
• Existing commit/conflict suites: 93 passed plus 13 subtests.
• Changed-file flake8 and Python 3.6 syntax checks passed.
• Independent core and facade/Java-semantics review found no blocking issues; extra batch/stream checks confirmed concurrent existing-row updates still conflict.

Prepared files remain preserved on commit failures or unknown outcomes.

[leaves12138]

Reviewed the Python facade and Java-semantics alignment. Native predicate deletes keep preparation failures on the fallback path while operation failures propagate, support batch/stream and partition/row predicates, and preserve snapshot/conflict semantics. The focused Python tests and all completed CI checks pass; Native CI is still pending. No blocking issues found.