chore: Test coverage tooling

[lanesawyer]

What

• Adds commands for generating test coverage so that we can more easily identify good areas for adding tests

How

• Followed the steps on the Vitest Coverage site: https://vitest.dev/guide/coverage.html
• Excluded the coverage directories from git and the formatting
• Added commands to each of the package.jsons with tests

Screenshots

PR Checklist

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  • Chrome (Fully supported)
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