Instrument faraday http client

We should track outgoing faraday calls so they show up as a layer in dashboards.

https://github.com/lostisland/faraday

- [x] Basic instrumentation
- [x] Add tests to test suite
- [x] Handle and log raised exceptions

Current issues:
- [x] Cross-app tracing generates broken traces
- [x] Faraday consistently takes a long time to initialize regardless of adapter - verify this