Use Wallaby to capture API response from FedEx

[btkostner]

So, FedEx has authentication for hitting the API endpoint. This makes it rather annoying to run the application because you have to sign up for a ton of services and set api tokens, yadayada. To make shppd easy to run, we should web scrape. Sadly it's rather annoying to parse HTML to get data. Luckily the user facing website just makes an API request. So, we can probably use Wallaby to grab that API call result, which is already nicely formatted.