Attach a different UUID to every request

[kbourgoin]

We've had a couple issues come in where it could be either a bug in a mobile app causing data to be sent more than once, or a bot hitting the data collection endpoint. Bots hitting that endpoint are very unlikely, but the information we send right now makes it hard to be certain. We should attach a diagnostic UUID (or any random number) to each request made so they can be uniquely identified. This would remove at least one source of uncertainty in our investigations.