Support Three.js tree-shaking

[pedroalmeida415]

Describe the feature you'd like:

Currently, import * as THREE from 'three' is used throughout the project, which always forces the entire Three.js package to be bundled with your app when using Drei.

Suggested implementation:

Replace import * as THREE from 'three' statements with named imports:

-  import * as THREE from 'three';
+  import { dependency1, dependency2, dependency3... } from 'three';

[pedroalmeida415]

The problem was actually in the analyzing tool I was using.