Add auto-updating capabilities to the electron app

[peterwangsc]

Works as follows:

npm run electron:build will create a macOS executable build on your local machine.

npm run electron:publish will create a draft release to your github repo.

Pre-reqs:

You will need Xcode and an apple developer certificate to code sign the application if you are building for Mac.

Once the app's new version is published on Github releases, the auto-updater should automatically download the update and prompt the user to restart. The new version will install upon restarting the app.

[aws-amplify-us-west-2[bot]]

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[davidkircos]

deprioritized