Add importOrderCaseInsensitive option

[timiles]

Case-insensitive option for ordering imports.

Example problem: with no import order specified, importing siblings "ThingsList" and "ThingView". I would like for them to listed in that order, as "s" comes before "V". But due to case sensitivity, upper case "V" actually comes before lower case "s", so we get:

import ThingView from './ThingView';
import ThingsList from './ThingsList';

This PR gives me the option to have:

import ThingsList from './ThingsList';
import ThingView from './ThingView';

[ayusharma]

HI @timiles , Thank you so much for the PR 🎉. We will include these changes in the new major release.

[ayusharma]

As this function receives four arguments now, it would be better to convert arguments to an object.

export const getSortedNodes = ({
      nodes: ImportDeclaration[],
      order: PrettierOptions['importOrder'],
      importOrderSeparation: boolean,
      importOrderCaseInsensitive: boolean}
    ) => {}

[timiles]

I can make this change next chance I get, it would also help fix the failing tests too (sorry, I thought they all passed before I pushed!)

[ayusharma]

@timiles there are some failing tests. Just a minor change to fix.

[timiles]

@ayusharma tests are fixed 👍

[ayusharma]

Hi @timiles , Thank you so much for your PR. Please respond to the notification here. #118