feat: export visualization module separately

[luoxuhai]

Description of change

For Example

NPM

import PointCloudViewer from 'pcl.js/PointCloudViewer'

new PointCloudViewer();

Script

<!-- Three.js -->
<script src="https://cdn.jsdelivr.net/npm/three/build/three.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three/examples/js/loaders/PCDLoader.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three/examples/js/controls/OrbitControls.js"></script>

<!-- pcl.js -->
<script src="https://cdn.jsdelivr.net/npm/pcl.js/dist/pcl.js"></script>
<script src="https://cdn.jsdelivr.net/npm/pcl.js/dist/visualization/PointCloudViewer.js"></script>
<script>
    new PointCloudViewer();
</script>

Pre-Merge Checklist

• [x] Tests and/or benchmarks are included
• [x] Documentation is changed or added
• [x] Lint process passed (npm run lint)
• [x] Tests passed (npm run test)

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Name	Status	Preview	Updated
pcl-js	✅ Ready (Inspect)	Visit Preview	Oct 6, 2022 at 8:15AM (UTC)