chore: update the exporting of services and web components in tooling and match the new pathing in sites

[janechu]

Pull Request

📖 Description

This change updates the export for @alpha web components and services from the @microsoft/fast-tooling package so they can be imported from the root location. It also corrects a few mis-typed const names that should be lowercase and it normalizes some file structures for easier exporting.

This change affects the Creator site and Explorer site as the pathing has been updated to reflect that these services and web components can now be imported from the root of the package.

Due to issues resulting from exporting web components from the root, jest test have been updated with mock files and the jest-environment-jsdom-sixteen package has been added to allow for more modern global methods assumed to be available in browsers.

👩‍💻 Reviewer Notes

It should not be necessary to run the sites as the build gate should break if the pathing is incorrect.

✅ Checklist

General

• I have included a change request file using $ yarn change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.