fix(python): set native module metadata (#3913)

PyO3 defaults native extension classes to `builtins`, so
mkdocstrings/Griffe could not resolve the newly documented
`lancedb.Session` alias and `Deploy docs to Pages` failed on `main`.
Declare the extension module for the public native types referenced by
the Python API docs so Griffe resolves them through `lancedb._lancedb`
and Pages can build again.

Validated with the docs toolchain used by CI (`griffe==0.49.0`,
`mkdocstrings==0.25.2`, and `mkdocs==1.6.1`); `PYTHONPATH=. mkdocs
build` succeeds.

python/src/session.rs

@@ -11,7 +11,7 @@ use pyo3::{PyResult, pyclass, pymethods};
 /// Sessions allow you to configure cache sizes for index and metadata caches,
 /// which can significantly impact memory use and performance. They can
 /// also be re-used across multiple connections to share the same cache state.
-#[pyclass(from_py_object)]
+#[pyclass(module = "lancedb._lancedb", from_py_object)]
 #[derive(Clone)]
 pub struct Session {
     pub(crate) inner: Arc<LanceSession>,