export hexToRgb from color-transformers

[renerbaffa]

WHY are these changes introduced?

hexToRgb is a utility function that was not export but still helpful for other projects

WHAT is this pull request doing?

Exporting hexToRgb function

How to 🎩

🖥 Local development instructions
🗒 General tophatting guidelines
📄 Changelog guidelines

Copy-paste this code in playground/Playground.tsx:

import React from 'react';
import {Page} from '../src';

export function Playground() {
  return (
    <Page title="Playground">
      {/* Add the code you want to test in here */}
    </Page>
  );
}

🎩 checklist

• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility
• Updated the component's README.md with documentation changes
• Tophatted documentation changes in the style guide

[github-actions]

size-limit report 📦

Path	Size
polaris-react-cjs	202.01 KB (+0.05% 🔺)
polaris-react-esm	129.23 KB (+0.07% 🔺)
polaris-react-esnext	183.37 KB (+0.05% 🔺)
polaris-react-css	40.62 KB (0%)

[kyledurand]

This is not necessary for building color components but makes it easier. Example to follow

Any reason we weren't previously exporting this @BPScott ?

Edit: Here's how it can be used