1-liner caches for NPM and Yarn

[thisismydesign]

Hopefully this is the right place to showcase actions. We simplified JS caching into 1-liners using the brand new @actions/cache package:

• https://github.com/c-hive/gha-npm-cache

• https://github.com/c-hive/gha-yarn-cache

Supports any OS, and most importantly does caching the right way.

[weide-zhou]

Thanks for your sharing! I checked with your two actions and both work perfectly.