Passing multidimensional array to Python results in a flat list

### Environment

-   Pythonnet version: 2.4.0
-   Python version: any
-   Operating System: any

### Details

```csharp
var array = new int[5,5];
dynamic numpyArray = np.array(array);
Console.WriteLine(numpyArray.shape);
```
Expected:
> (5, 5)

Actual:

> 25

### Workaround

Write a custom `IPyObjectEncoder` for multidimensional arrays.