Create Styles: Update rtlcss to the latest v3 for PostCSS v8

[ItsJonQ]

The easiest way to test would be to go into the rtl.js plugin and adjust the return condition to force RTL processing:

function stylisRTLPlugin(context, content) {
    if (context === STYLIS_PROPERTY_CONTEXT) {
        // pass four undefineds to let TS know which overload we're using
        return true
            ? rtlcss.process(content, undefined, undefined, undefined)
            : undefined;
    }
    return undefined;
}

Resolves https://github.com/ItsJonQ/g2/issues/245

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/itsjonq/g2/aqo00qzt7
✅ Preview: https://g2-git-update-rtlcss-v3.itsjonq.vercel.app

[gziolo]

I wanted to check if there is a way to switch locale in Storybook instead. I see there is an addon that would be useful for testing: https://github.com/goooseman/storybook-addon-i18n

I haven't tested but I guess you can merge it based on the screenshot shared 👍🏻

[ItsJonQ]

@gziolo Thank you!! I do want to figure out how to improve the testing of RTL. And if possible (gasp) make it dynamic.