PointCloud.points has no elements and read only

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](https://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](https://www.open3d.org/docs/release/) and the [latest documentation](https://www.open3d.org/docs/latest/) (for `main` branch).

### Describe the issue

The points property is readonly, so I have created the point cloud passing a Vector3dVector(nparray) in the constructor. A point cloud has_points() gives True, te get_minimal_oriented_bounding_box() works well, but the points property stores an empty numpy array.

### Steps to reproduce the bug

```python
pcd
Out [2]: PointCloud with 977 points.

pcd.points
Out [3]: array([], shape=(0, 3), dtype=float64)

pcd.points=np.array([[1,3,3]])
*** AttributeError: 'open3d.cpu.pybind.geometry.PointCloud' object attribute 'points' is read-only
```

### Error message

_No response_

### Expected behavior

_No response_

### Open3D, Python and System information

```markdown
- Operating system: Windows 11 64-bit
- Python version: 3.10.11
- Open3D version: 0.18.0
- System architecture: x86 pi
- Is this a remote workstation?: no
- How did you install Open3D?: pip
- Compiler version (if built from source):
```

### Additional information

_No response_