fix: return a Python error when querying a closed table (#4455)

`AsyncTable.query()` unwraps the native closed-table error, so querying
a closed table raises `PanicException` instead of the documented
`RuntimeError`. `AsyncTable.head()` reaches the same path.

Propagate `inner_ref()`'s error through `PyResult` instead. Add
regressions for closed `query()` and `head()`, with `count_rows()`,
repeated close, and normal open-table queries as controls.

Validation against separately built native bindings:

- Before: 2 regression failures (`PanicException`), 2 controls passed.
- After: all 4 regressions passed.
- Existing query tests plus the basic database test: 102 passed, 1
skipped on each arm (Torch is not installed).
- `cargo fmt --all -- --check`, Ruff, and `git diff --check` passed.

The native build used the locked Cargo dependencies with
`remote,lancedb/metrics-otel,pyo3/extension-module`. This is source-tree
native testing, not a complete wheel-packaging or cloud-service test.

Signed-off-by: Xucheng Zhou <aden1350@outlook.com>

python/src/table.rs

@@ -1428,8 +1428,8 @@ impl Table {
         })
     }
 
-    pub fn query(&self) -> Query {
-        Query::new(self.inner_ref().unwrap().query())
+    pub fn query(&self) -> PyResult<Query> {
+        Ok(Query::new(self.inner_ref()?.query()))
     }
 
     #[getter]