How to set OpenTelemetry tracing parameters?

[boramalper]

See https://github.com/cloudevents/sdk-go/issues/693

Possibly relevant other issues:

• https://github.com/knative/eventing/issues/1757
• https://github.com/knative/eventing/pull/1858

[ustiugov]

It seems that cloudevents added an observability service and an alternative solution via the middleware that can be used to trace event-based workloads.

Relevant links:

• our PR
• observability service PR
• passing via middleware (an alternative solution to the observability service)