gh-102213: Optimize the performance of __getattr__ (GH-102248)

When __getattr__ is defined, python with try to find an attribute using _PyObject_GenericGetAttrWithDict
find nothing is reasonable so we don't need an exception, it will hurt performance.

Objects/object.c

@@ -1405,6 +1405,12 @@ PyObject_GenericGetAttr(PyObject *obj, PyObject *name)
     return _PyObject_GenericGetAttrWithDict(obj, name, NULL, 0);
 }
 
+PyObject *
+_PyObject_GenericTryGetAttr(PyObject *obj, PyObject *name)
+{
+    return _PyObject_GenericGetAttrWithDict(obj, name, NULL, 1);
+}
+
 int
 _PyObject_GenericSetAttrWithDict(PyObject *obj, PyObject *name,
                                  PyObject *value, PyObject *dict)