Resurrect OpenTelemetry

In the effort of improving observability, we'd like to 1) see whether the opentelemetry integrations still work, 2) try turning them on by default, and 3) provide some documentation for both developers and users to actually use them. At very least, event logs could be attached to bug reports, and we may also be able to get realtime diagnostic information via Tracy.

We also might try switching from https://hackage.haskell.org/package/opentelemetry to https://hackage.haskell.org/package/hs-opentelemetry-sdk, which is more active.