Set up unit testing boilerplate and github actions

[GraysonKornberg]

No description provided.

[zeim839]

Instead of creating a separate GitHub action, you can run tests on all supported architectures by setting:

    "beforeBuildCommand": "npm run test && npm run build"

In src-tauri/tauri.conf.json. What we're basically doing in GitHub actions is calling npm run tauri build, so everything in beforeBuildCommand gets called before Tauri builds the binary. This tests everything for us and any test/lint errors automatically cause the GitHub actions to fail.