[FEATURE] Ability to get pointclouds from ARCore

[state-of-the-art]

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

We need some default pointcloud provider to work even without a d400 cameras or build a skeletal pointcloud. Of course ARCore will not give us a good precision pointcloud, but that will be something.

Describe the solution you'd like

We can get the current pointcloud from ARCore, need to specify the provider interface and rethink the PointCloud class & logic.