Support otlp trace exporter and current otel libraries (#102)

Configuration diverges from the environment specification, https://opentelemetry.io/docs/reference/specification/sdk-environment-variables/#exporter-selection, in that the default OTEL_TRACES_EXPORTER is none. This is to provide compatibility with the previous default and to avoid surprising infrastructure dependencies.

Other changes in configuration are due to changes in the OpenTelemetry Jaeger exporter as of v0.20.0: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.20.0.

As it is deprecated, we will remove support for the Jaeger exporter in a future version. This is intended as a migration-enabling version to allow people to convert from jaeger to the otlp exporter.

Update opentsdb-goclient to support arbitrary URLs (#101)

Merge pull request #91 from G-Research/SREWRK-1440-tracing-log-traceid

Add traceID to log entries were a trace span is available

Merge pull request #89 from G-Research/SREWRK-1440-tracing

Add distributed tracing (OpenTelemetry, Jaeger exporter)

Switch to GitHub actions (#90)

* Switch to GitHub actions

* Use different source of thanos because we can't pull from docker hub due
to rate limits...

* Move integration test to Docker run only

* Switch to new image path under gresearch org

* Add an empty circleci config until an admin can delete it

Dearm test; only run autobuild on master