[Beta] optimize build

[thompsongl]

Summary

Begins #5537

optimize build:

• Beta
  • Use this as the starting point for a proper development-production environment split
  • Anticipating future changes, but starting with required changes for Kibana
  • Kibana!
    • kbn-ui-shared-deps uses (without possible exception) the production version of libraries
    • We need to get back to the previous bundle size baseline, but don't yet want to commit to an process.env-based split in EUI without further planning
• Excludes propTypes generation
• Uses @babel/plugin-transform-runtime
  • Requires that consuming applications use @babel/runtime (Kibana already does)
  • Part of the reason I decided to mark this as beta. Want to validate that this extra [peer]Dep is worthwhile.
• optimize/lib/ is nearly half the size of lib/ (3.7MB vs 7.1MB) 😳

Checklist

• Check against all themes for compatibility in both light and dark modes
• Checked in mobile
• Checked in Chrome, Safari, Edge, and Firefox
• Props have proper autodocs and playground toggles
• Added documentation
• Checked Code Sandbox works for any docs examples
• Checked for breaking changes and labeled appropriately
• Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5527/

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5527/

[chandlerprall]

Changes LGTM, build runs locally. Have you tested building Kibana with the optimize version & the webpack alias?

[thompsongl]

Have you tested building Kibana with the optimize version & the webpack alias?

Yep! That's how I validated the resolve.alias change. Everything appears to work as normal.
Also, we should see a reduction in the dll bundle to below its baseline size. I think the sizes reported by the analyzer are compressed/minified:

• Baseline: 13.3MB / 5.1MB
• Increase: 14.9MB / 6.1MB
• Optimize: 11.9MB / ?

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5527/

[chandlerprall]

Looking forward to seeing the dll bundle difference!

[cee-chen]

🎉 also similarly excited!!