no implmentation of `ps.get_camera_world_position`

[a1600012888]

Hi, thanks for the wonderful project and also building tools like polyscope.

def save_render_current_view(
    args, implicit_func, params, cast_frustum, opts, matcaps, surf_color
):

    root = ps.get_camera_world_position()
    look, up, left = ps.get_camera_frame()
    fov_deg = ps.get_field_of_view()

In the main_spelunking.py, at line 41: https://github.com/nmwsharp/neural-implicit-queries/blob/main/src/main_spelunking.py#L41

Seems that current public version of polyscope does not contain implementation of get_camera_world_positions.