feat: switch to gltf crate and remove easy_gltf

This is because easy_gltf did not expose texture information, which the gltf crate did.

test_scene.scene

@@ -17,9 +17,9 @@
           0.0
         ],
         "scale": [
-          20.0,
-          20.0,
-          20.0
+          1.0,
+          1.0,
+          1.0
         ]
     }
   }