abstract source of cloud_bind_group (e.g. packed vs. planar)

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https://github.com/mosure/bevy_gaussian_splatting/blob/507a28dda771518415d762f85db7607ea60bfbe8/src/render/mod.rs#L988

            None => return RenderCommandResult::Failure,
        };

        pass.set_bind_group(2, &bind_groups.cloud_bind_group, &[]); // TODO: abstract source of cloud_bind_group (e.g. packed vs. planar)
        pass.set_bind_group(3, &bind_groups.sorted_bind_group, &[]);

        #[cfg(feature = "webgl2")]
        pass.draw(0..4, 0..gpu_gaussian_cloud.count as u32);

        #[cfg(not(feature = "webgl2"))]
        pass.draw_indirect(&gpu_gaussian_cloud.draw_indirect_buffer, 0);

        RenderCommandResult::Success

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Closed in eb0fcc33900f7ad99357d7251f9b5da4c1cab89b