Support remote logging of events via `otlp`

[jfallows]

Describe the desired outcome from the user's perspective
As devops, I want to understand why zilla is not behaving as expected when integrating with external actors such as authenticating clients, Kafka broker authorization or API version support, or DNS servers, so that I can correct either zilla.yaml or the external system setup as needed.

Acceptance criteria

• otlp exporter of named events

Additional context
Depends on #679

Tasks

• Implement otlp telemetry exporter (events only)
• Document otlp telemetry exporter (reference, events)