Use Otel semantic conventions for attributes

[clintonb]

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

Describe the solution you'd like
Use OpenTelemetry's semantic conventions for messaging. This ensures consistency with other messaging systems, and (more importantly) enables UI/UX features in tooling such as Datadog (as captured below).

Describe alternatives you've considered
I am sticking with https://github.com/appsignal/opentelemetry-instrumentation-bullmq for now since using bullmq-otel would require me to update queries and charts. That library follows semantic conventions: https://github.com/appsignal/opentelemetry-instrumentation-bullmq/blob/main/src/attributes.ts.

Additional context
Add any other context or screenshots about the feature request here.

[manast]

I think the important here is that bullmq-otel adheres to Otel conventions, but having a generic naming of attributes that is not tied specifically to Otel in BullMQ as we want our telemetry interface to be generic and not hard tied to Otel.