feat: toy tutorial chapter 4.

Signed-off-by: jackfiled <xcrenchangjun@outlook.com>

include/hello/ShapeInferenceInterface.td

@@ -0,0 +1,18 @@
+#ifndef SHAPE_INFERENCE_INTERFACE
+#define SHAPE_INFERENCE_INTERFACE
+
+include "mlir/IR/OpBase.td"
+
+def ShapeInferenceOpInterface : OpInterface<"ShapeInference"> {
+    let description = [{
+        Interface to access a registered method to infer the return types for an
+        operation that can be used during type inference.
+    }];
+
+    let methods = [
+        InterfaceMethod<"Infer and set the output shape for the current operation.",
+                            "void", "inferShapes">
+    ];
+}
+
+#endif