Respect package.json#sideEffects and skip those files

[matzeeable]

Hey!

In webpack, it is possible to mark files which allow side effects via package.json#sideEffects.

At first try, I figured out that this plugin does not respect this configuration.

What do you think about this? 😊

[lukastaegert]

If you think there is a reasonable way to incorporate this, PRs are usually welcome.

[matzeeable]

Yeah, this would be cool and I could create a PR for this. But do you know a way in ESLint to get the projects' package.json path?