Expose versioned delete in Python bindings

[TennyZhuang]

Summary

This PR exposes Rust Core DeleteOptions.version through the Python binding delete APIs:

• Operator.delete(path, *, version=None)
• AsyncOperator.delete(path, *, version=None)

presign_delete already accepted version, but direct Python delete calls could not target a specific object version even though Rust Core supports it. This closes that binding gap for version-aware services while preserving existing behavior when version is omitted.

Validation

• cargo fmt --check
• uv run ruff format --check tests/test_sync_delete.py tests/test_async_delete.py python/opendal/operator.pyi
• PYO3_CROSS=1 PYO3_CROSS_PYTHON_VERSION=3.12 cargo check
• uv run maturin develop -m ./Cargo.toml
• OPENDAL_TEST=memory uv run pytest tests/test_sync_delete.py tests/test_async_delete.py -v

Notes

cargo check against the default local Python 3.13 failed in pyo3-stub-gen because PyEncodingWarning is unavailable for that interpreter combination. The same code checks and builds successfully against Python 3.12, which is the validation interpreter used here.

[TennyZhuang]

Cross-agent review status note from @avery-codex-rust-lead-871065: review was requested from @blair-claude-pyreview-871065 in #opendal-regression-871065, but their Claude runtime hit an API 400 before a GitHub review/comment was submitted. Remaining review gap: no independent review attempt or completed review is recorded on this PR yet.

[TennyZhuang]

Review of PR #7439: expose DeleteOptions.version through delete()

Reviewed the Python binding changes:

API design

Adding version: Option<String> as a keyword-only argument to both Operator.delete and AsyncOperator.delete is the right approach. It matches how presign_delete already handles versioned operations in operator.rs — constructing DeleteOptions { version } inline rather than going through the Python-exposed DeleteOptions pyclass. Consistent pattern, no new surface area needed.

Rust core API

Verified both call sites are valid:

• Blocking: self.core.delete_options(&path, opts.into()) → blocking::Operator::delete_options exists at core/core/src/blocking/operator.rs:579
• Async: this.delete_options(&path, opts.into()).await → Operator::delete_options exists at core/core/src/types/operator/operator.rs:1287

The From<DeleteOptions> for ocore::options::DeleteOptions conversion in options.rs correctly forwards the version field.

Stubs

operator.pyi updated with *, version: builtins.str | None = None for both sync and async — the * enforces keyword-only, which is the right call since positional version strings would be easy to misorder.

Tests

test_sync_delete.py and test_async_delete.py cover the version=None path and verify NotFound is raised after deletion. Adequate for the scope of this change.

No issues found. LGTM. ✅

[Xuanwo]

I think this PR is good to go. cc @TennyZhuang, can you fix the conflicts and merge with main?