[SofaPython3] Add type coercion from numpy array to sofa parsable string (in object creation)

So we can write:
```python
def createScene(root):
	root.addObject("MechanicalObject", name="loader", filename="mesh/cube.obj")
	root.addObject("MechanicalObject", name="dofs", position=root.loader.position)        # to make a link
	root.addObject("MechanicalObject", name="dofs", position=root.loader.position.value)  # to make a copy by value
```

Author: damienmarchal

Plugin/src/SofaPython3/DataHelper.cpp

@@ -52,8 +52,16 @@ std::string toSofaParsableString(const py::handle& p)
     if(py::isinstance<sofa::core::objectmodel::BaseData>(p))
     {
         sofa::core::objectmodel::BaseData* data = py::cast<sofa::core::objectmodel::BaseData*>(p);
-        return data->getValueString();
+        return data->getLinkPath();
     }
+
+    // If the object is a numpy array we convert it to a list then to a sofa string
+    if(py::isinstance<py::array>(p))
+    {
+        py::object o = p.attr("tolist")();
+        return toSofaParsableString(o);
+    }
+
     return py::repr(p);
 }