How to use pulsartracing given it's an internal package

Hi there,

I'm trying to produce tracing spans alongside my messages and seems like `pulsartracing` would do the job quite well.

The problem is that, according to the documentation (https://pkg.go.dev/github.com/apache/pulsar-client-go/pulsar/internal/pulsartracing#section-readme), the interceptor needs to be injected within the `ProducerOptions`, which I'm struggling to do given that the package is internal.

Is there any solution other than copy&paste the whole package?

Thank you

Start with the pulsartracing README and the ProducerOptions entry point to trace how the interceptor is injected and why the internal package boundary applies. The issue is done when a supported public usage path, or a documented limitation and alternative, is established in the relevant documentation.

Written by the indexing model from the issue text.