[cmd/opampsupervisor] Emit spans via trace exporter

[bacherfl]

Component(s)

cmd/opampsupervisor

Is your feature request related to a problem? Please describe.

With the recently introduced telemetry settings for the OpAMP supervisor config, we could make use of those and emit spans from the OpAMP supervisor, e.g. for:

• The start of the supervisor (There is a PR that emits a span for the bootstrap info retrieval, but this could be extended to the full startup sequence of the supervisor
• handling messages from the agent
• handling messages from the server
• applying a new config and restarting the collector

Describe the solution you'd like

Make use of the telemetry options to emit spans

Describe alternatives you've considered

No response

Additional context

If this is something we want, I can create a PR for this

[github-actions]

Pinging code owners:

• cmd/opampsupervisor: @evan-bradley @atoulme @tigrannajaryan

See Adding Labels via Comments if you do not have permissions to add labels yourself.