use glTF Camera

### Description

Hi all,

Currently model and animation are viewed from default camera provided by model-viewer( as per my knowledge). Is there any way one can view through camera that's exported along with model.

Below I have attached a drive link where there is video in which you can see I have used https://gltf-viewer.donmccurdy.com/ to view model. In camera there is 2 options default and camera_orientation. I can relate model-viewer camera to default camera from the above site and I wanted to know is there any way to view from camera_orientation using model-viewer? If not I would like to be this as a feature.

Drive link : https://drive.google.com/file/d/1np0sFv4zIfPdqLmUrnO3IKTeKfi-PWcU/view?usp=sharing

Thanks,
Avinash