feat(vortex-python): Add OpenDAL-backed CosStore to the Python object-store API

[XuQianJin-Stars]

Bump opendal / object_store_opendal to 0.57.0 (in vortex-object-store-opendal); opendal 0.57 enables COS versioning by default.

Vendor pyo3-object_store 0.11.0 via [patch.crates-io] so we can add From<Arc<dyn ObjectStore>> for PyObjectStore. This lets any store implementation (including the new OpenDAL-backed COS store) be wrapped as a PyObjectStore and passed directly to vortex.io.read_url(store=...) / vortex.io.write(..., store=...).

Add vendor/pyo3-object_store with the new from_store constructor + From impl.

Expose the CosStore pyclass (gated on the opendal feature) that builds an OpenDAL services::Cos OpendalStore and can be passed as the store= argument.

Introduce AnyVortexStore in io.rs so read_url / write accept both the built-in pyo3-object_store classes and the new COS store.

Document the standalone-store usage and add unit tests.

Rationale for this change

Closes: #8844

Vortex's Python API already exposes concrete, standalone store objects for S3/Azure/GCS/HTTP/Local/Memory, but Tencent COS was only reachable through URL-based cos:// resolution that relied on environment variables. This adds a first-class CosStore so COS can be used exactly like the other stores (construct once, pass via store=), with better ergonomics and type checking.

What changes are included in this PR?

• opendal / object_store_opendal bumped to 0.57.0
• vendored pyo3-object_store 0.11.0 with the from_store constructor
• new CosStore pyclass (opendal feature) wrapping an OpenDAL COS OpendalStore
• AnyVortexStore extractor in io.rs so read_url/write accept the new store
• docs + unit tests for the standalone-store path

What APIs are changed? Are there any user-facing changes?

New public API (Python, opendal feature):

• vortex.store.CosStore(bucket, endpoint, *, secret_id=None, secret_key=None, root=None, disable_config_load=False) — a standalone ObjectStore you can pass to vortex.io.read_url(url, store=...) / vortex.io.write(arrays, path, store=...).

User-facing change: users can now build a COS store object directly and pass it to read_url/write, instead of only configuring cos:// via environment variables (TENCENTCLOUD_SECRET_ID / TENCENTCLOUD_SECRET_KEY / COS_ENDPOINT). The existing cos:// URL resolution is unchanged.

No breaking changes to existing APIs.