API type experiment

[dej611]

Summary

This PR makes types exposed at the API level unpacked and a bit easier to use within the development process.

Here's the previous type contract in a typical API type:

Here's the new one:

Details

Issues

Checklist

• The proper chart type label has been added (e.g. :xy, :partition)
• The proper feature labels have been added (e.g. :interactions, :axis)
• The :theme label has been added and the @elastic/eui-design team has been pinged when there are Theme API changes
• All related issues have been linked (i.e. closes #123, fixes #123)
• New public API exports have been added to packages/charts/src/index.ts
• Unit tests have been added or updated to match the most common scenarios
• The proper documentation and/or storybook story has been added or updated
• The code has been checked for cross-browser compatibility (Chrome, Firefox, Safari, Edge)
• Visual changes have been tested with all available themes including dark, light, eui-dark & eui-light

[elastic-datavis]

Deployments - 8c3769e

• Storybook (link)
• e2e server (link)
• Playwright report (link)

[nickofthyme]

This is interesting, @monfera was talking about doing something like this to flatten our API types.