Add typescript config for storybook and testing

[chaance]

Thank you for contributing to Reach UI! Please fill in this template before submitting your PR to help us process your request more quickly.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code (Compile and run).
• Add or edit tests to reflect the change (Run with yarn test).
• Add or edit Storybook examples to reflect the change (Run with yarn start).
• Ensure formatting is consistent with the project's Prettier configuration.

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• Creates a new package
• Fixes a bug in an existing package
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• Updates documentation or example code
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