Implement automatic submission to Chrome Web Store

[fregante]

To release a new version, Todd currently downloads an artifact from Actions and uploads it to the Chrome Web Store.

The upload step can be automated with https://github.com/fregante/chrome-webstore-upload-cli

A setup example can be found here: https://github.com/fregante/ghatemplates/blob/251e81a890ed94fdcfb8714e1a8250687bd26d26/webext/release.yml#L52-L68

The API key guide found on the first repo might be outdated so I'll have to test it and update the two modules. (A lot) more info in fregante/chrome-webstore-upload#46

@twschiller feel free to ping me or remove the "low priority" label to start working on this or to discuss any limitations of this approach.

[fregante]

The required changes have been made: https://github.com/fregante/chrome-webstore-upload-cli/releases/tag/v2.0.0

Feel free to generate and add the keys to the repo so I can add a workflow that will trigger on tags (or manually, on specific branches)