`read_point_cloud` from buffer (not filename string)

Point cloud files can be loaded using filename, e.g.:

`pcd = open3d.io.read_point_cloud("pointcloud.ply")`

Is there a way to load from a file that has already been read into a buffer? E.g. something like this:

```python
with open("pointcloud.ply", "b") as f:
buffer = f.read()
pcd = open3d.io.read_point_cloud(buffer, format="ply")
```

My use case is the ply files are read from a zip archive so I don't want to save individual ply files to disk so that open3d can load them.