Add fileInfoOptions to override options passed to prettier.getFileInfo

[making3]

This change is meant to add a similar option as the eslint-plugin-prettier package, allowing developers to pass options to prettier.getFileInfo.

Our team's use case is that we are running Stylelint through the Node.js API, but targeting specific directories that each have their own .prettierignore configuration. Since our script isn't in each of these directories, the incorrect .prettierignore is grabbed (i.e. it's looking at where the script is running by default).

I did not create an issue for this, but let me know if you prefer having an issue to link or any other guidelines. I didn't see a whole lot on the contributing guidelines, but happy to update anything.

See the eslint-plugin-prettier PR here for the related PR on the ESLint side.

[making3]

Small note - ESLint has a third "slot" for options, I did not find a similar pattern for Stylelint, but I may just be not as familiar.

Theirs looks like this:

"prettier/prettier": ["error", { /* this is where Stylelint configures fileInfoOptions instead */ }, {
  "fileInfoOptions": {
    "withNodeModules": true
  }
}]

Let me know if there is a preferred approach instead.