Add Instrumentation for Typhoeus HTTP Client

We currently don't capture performance metrics from this client.  Let's fix that.

https://github.com/typhoeus/typhoeus

- [x] Add Typhoeus to Oboe::Config
- [x] Add Typhoeus to the gem bundle
- [x] Instrument Synchronous HTTP calls
- [x] Validate all reported Service KVs
- [x] Handle request error conditions
- [x] Add tests to validate sync calls
- [x] Instrument Hydra client
- [x] Add tests to validate Hydra calls
- [x] Test with libcurl instrumentation [no additional metrics]