refactor: Change the access modifier for sample code to hide APIs fro…

…m documents (Unity-Technologies#644)

chore: Upgrade package version 2.2.2 (Unity-Technologies#364)

* fix package.json of template projects (Unity-Technologies#357)

* [skip ci] Update unitypacakge

* update package version 2.2.2

upgrade package version 2.2.1-preview (Unity-Technologies#355)

(cherry picked from commit 0babb9cba1e34101fc357a365a6ddc607cb4843c)

remove CI trigger of the template test (Unity-Technologies#342)