develop 3d classification inference example

[Nic-Ma]

Is your feature request related to a problem? Please describe.
Now we already have array/dict based training/inference examples of 3D segmentation.
But only have 1 array based training example of 3D classification.
Need to develop:
(1) dict based 3D classification training example.
(2) array based 3D classification inference example.
(3) dict based 3D classification inference example.
(4) [optional] save classification results into CSV file.