Add light, zoom and camera controls to Model3D

[hannahblair]

Notes:

• the gradio-component create command didn't work seamlessly with Model3D; I had to npm install babylonjs, and tweak the import syntax from import * as BABYLON from 'babylonjs' to import BABYLON from 'babylonjs'
• testing this has also raised the issue around our current Model3D - it doesn't seem to support files up until a certain size. haven't properly debugged this yet though
• uploading files isn't working, so I hardcoded the value to Duck.glb in the frontend dir