[IO] Add Velodyne VLP-32 Support in Grabber

Is your feature request related to a problem? Please describe.

Velodyne VLP 32 Support

Context

Getting point cloud data from Velodyne VLP-32

Expected behavior

PCL Grabber should be able to get data from Velodyne VLP-32.

Current Behavior

PCL Grabber only able to get data from Velodyne HDL-64, HDL-32 and VLP-16.

Describe the solution you'd like

Implement Velodyne VLP-32. Grabber code (pull request !4519 added)

Since VLP-16 Grabber class is not subclass friendly (essential class methods are not virtual), I made quick copy from VLP 16 class with necessary renaming and adding Velodyne VLP-32 specific parameters.

Describe alternatives you've considered
Rewriting VLP Grabber to be virtual class. Then rewrite VLP-16 grabber, before implementing VLP-32 grabber. This way both class can be both cleanly implemented without ugly code duplication.

I do not have time as of now, I see the request for VLP-32 support has been hanging in limbo for at least 3 years (See #2098)

Additional context

none

Review the existing HDL-64, HDL-32, and VLP-16 grabbers, then inspect the implementation referenced in pull request !4519 and the VLP-32-specific parameters. Confirm the grabber can receive Velodyne VLP-32 point-cloud data and that the relevant integration or regression coverage passes.