Add support for point cloud classification

[giswqs]

Add support for classifying point cloud data into different categories, such as buildings, trees, cars, power lines, etc.

Reference: https://github.com/isl-org/Open3D-ML

https://github.com/Pointcept/Utonia
https://marionacaros.github.io/terlidar

[tjjb69]

This would be a very interesting feature to add.