Publish JS artifacts to npm

[fullkomnun]

Publish to npm / GitHub Packages npm registry, possibly using 'npm-pubish' gradle plugin.

Other resources about publication to npm:

• Another less mature gradle plugin: 'kt-npm-publish'
• Gradle deployment script from Kotlinx/coroutines
• Publish your backend API typings as an NPM package
• Kotlin/JS 1.4, how to output a NPM package?

With the new IR backend, it is also possible to generate [TypeScript declaration files](TypeScript declaration files)