The ARCloudAnchor is an ARCore Extensions object that provides a similar service to AR Foundation's ARAnchor as an anchor for game objects in your scene.
The ARCoreExtensionsCameraConfigFilter class is used by the camera manager to derive a list of camera configurations available on the device at runtime.
The ARGeospatialAnchor is an ARCore Extensions object that provides a similar service to AR Foundation's ARAnchor as an anchor for game objects in your scene.