build(storybook): update from webpack to vite to build storybook

[matthewgallo]

Closes #4986 Closes #4946

This PR moves our storybook builds from webpack to vite. This includes significant performance improvements for both startup times and build times.

Moving to vite required renaming all story files to use .jsx and appending ?inline to the imported style file for each story that has one (this is the only way to include a default import of a style file in vite, see here for more details).

We were able to remove several babel and webpack packages from packages/core/package.json with this change. Another part that is included in this PR is removing the storybook-carbon-addon-theme. It's been replaced with a similar approach to Carbon, theme can be changed from top toolbar.

What did you change?

Storybook config files Renamed all story files from .stories.js to .stories.jsx

How did you test and verify your work?

Verified that running storybook locally works and storybook can also be built as expected (yarn storybook:build).

Storybook startup after move to vite ~1 sec

[netlify[bot]]

✅ Deploy Preview for carbon-for-ibm-products ready!

Name	Link
🔨 Latest commit	29080a418ed0c4bb28a4c85f0af41b638a6900f0
🔍 Latest deploy log	https://app.netlify.com/sites/carbon-for-ibm-products/deploys/6638d6572dae6300082e9d5f
😎 Deploy Preview	https://deploy-preview-4987--carbon-for-ibm-products.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.