Function gpu_icp 

pub async fn gpu_icp(
    gpu_context: &GpuContext,
    source: &PointCloud<Point3f>,
    target: &PointCloud<Point3f>,
    max_iterations: usize,
    convergence_threshold: f32,
    max_correspondence_distance: f32,
) -> Result<Isometry3<f32>>

GPU-accelerated ICP registration