feat: SDK surface for functions, materialized views, jobs, refresh_column

Adds the derived-compute interface to the SDK:

- Database trait: create/list/drop_function, create/refresh/alter/
  drop/list_materialized_view, list_jobs -- default implementations
  return Error::NotSupported (NotImplementedError in python), so
  existing Database impls are unaffected; local single-node
  implementations are planned. BaseTable gains refresh_column with
  the same default.
- RemoteDatabase/RemoteTable implement them against the server REST
  routes (/v1/function/*, /v1/materialized_view/*, /v1/job/list,
  /v1/table/{id}/refresh_column), with mock-HTTP unit tests.
- Connection/Table public methods, pyo3 bindings (FunctionInfo,
  MaterializedViewInfo, JobInfo pyclasses), and python wrappers:
  sync on the DBConnection base (shared by local and remote
  connections), async on AsyncConnection; refresh_column on
  LanceTable, RemoteTable, and AsyncTable.

python/src/table.rs

@@ -1060,6 +1060,23 @@ impl Table {
         })
     }
 
+    #[pyo3(signature = (columns, where_clause=None, num_workers=None, max_workers=None))]
+    pub fn refresh_column(
+        self_: PyRef<'_, Self>,
+        columns: Vec<String>,
+        where_clause: Option<String>,
+        num_workers: Option<u32>,
+        max_workers: Option<u32>,
+    ) -> PyResult<Bound<'_, PyAny>> {
+        let inner = self_.inner_ref()?.clone();
+        future_into_py(self_.py(), async move {
+            inner
+                .refresh_column(&columns, where_clause, num_workers, max_workers)
+                .await
+                .infer_error()
+        })
+    }
+
     pub fn add_columns(
         self_: PyRef<'_, Self>,
         definitions: Vec<(String, String)>,