Examples: add `three/addons/*` alias (#23406)

* Examples: use three/addons/* alias

* Npm: add three/addons/* alias

* Examples: remove unnecessary package.json

* Fix: remove build folder from PR

* Docs: use three/addons/ alias

* Editor: use three/addons/ alias

* Manual: use three/addons/ alias

* Manual: use three/addons/ alias in examples

* Add alias to new examples

* Add alias to new manual entries