1. we want optionally to log the body (we don't want to log the body when we're fetching psiphon secrets or tor targets) 2. we want body logging to _also_ happen on error since this is quite useful to debug possible errors when accessing the API This diff adds the above functionality, which were previously described in https://github.com/ooni/probe/issues/1951. This diff also adds comprehensive testing.
Package github.com/ooni/probe-engine/probeservices
This package contains code to contact OONI probe services.
The probe services are HTTPS endpoints distributed across a bunch of data centres implementing a bunch of OONI APIs. When started, OONI will benchmark the available probe services and select the fastest one. Eventually all the possible OONI APIs will run as probe services.