Adding StatHat reporting to the tips delivery code

@DeeZone I wanted to throw some StatHat tracking into the tips code to go along with the tips refactoring PR.

This just uses a `stathat` library that already existed on npm. Thinking about maybe creating our own internal sort of `ds-stathat` node library to match our usage of StatHat in our message broker code.

But for now, this seems sufficient. Tested and verified the new stats showed up in StatHat.