Development improvements

[sradevski]

Once #1208 gets merged, we'll already be in a much better place that should allow easier contributions to rendition, but there are still some things to improve. This is just a list of things so we don't forget.

• Switch from enzyme to react-testing-library as a more lightweight solution
• Investigate an issue where storyshots stop running if an argument is null (see Alert for commented out null for example)
• Add dark mode toggling again (see if we can use the built-in background switch for it)
• Improve the typings in the tests. As a way to make the migration faster, I sprinkled a lot of anys around.
• Investigate the tooltip props and understand why it doesn't work anywhere
• Investigate Element and understand why if modified it breaks storybooks.
• Investigate as props, probably to remove from docs since internal
• Investigate forwardedAs props, probably to remove from docs since internal
• Trim down documentation on some of the components in favor of better autodetection/simpler API. A couple that come to mind are the Terminal and JsonSchemaRenderer
• Improve documentation and props displayed of the following components:

  • Flex
  • Heading
  • ButtonGroup
  • Link
  • Select
• Investigate on how to remove webpack config from .storybook/main.js added to correctly load the JsonEditor used in JsonSchemaRendererPlayground. (can probably replace react-monaco-editorwith https://www.npmjs.com/package/@monaco-editor/react