[MLIR][CAPI][python] expose the python binding for linalgOp.getIndexingMaps (#136054)

This PR is mainly about exposing the python bindings for
`linalgOp.getIndexingMaps`.

---------

Signed-off-by: Bangtian Liu <[email protected]>

Author: bangtianliu

DialectLinalg.cpp

@@ -120,6 +120,16 @@ static void populateDialectLinalgSubmodule(nb::module_ m) {
 
   m.def("infer_convolution_dimensions", &InferConvolutionDimensions,
         "Infers convolution dimensions", nb::arg("op"));
+
+  m.def(
+      "get_indexing_maps",
+      [](MlirOperation op) -> std::optional<MlirAttribute> {
+        MlirAttribute attr = mlirLinalgGetIndexingMapsAttribute(op);
+        if (mlirAttributeIsNull(attr))
+          return std::nullopt;
+        return attr;
+      },
+      "Returns the indexing_maps attribute for a linalg op.");
 }
 
 NB_MODULE(_mlirDialectsLinalg, m) {