Export io.vertx.tracing.opentelemetry package

[ZenLiuCN]

Motivation:

export io.vertx.tracing.opentelemetry that makes OpenTelemetryOptions usable with JPMS.

Conformance:

You should have signed the Eclipse Contributor Agreement as explained in https://github.com/eclipse/vert.x/blob/master/CONTRIBUTING.md
Please also make sure you adhere to the code style guidelines: https://github.com/vert-x3/wiki/wiki/Vert.x-code-style-guidelines

[ZenLiuCN]

This will restore example to usable for JPMS, otherwise it may trigger Javadoc complain about unexports package

  public void ex1() {
    Vertx vertx = Vertx.vertx(new VertxOptions()
      .setTracingOptions(
        new OpenTelemetryOptions()
      )
    );
  }

[tsegismont]

Thanks @ZenLiuCN

Yes, this is required. But we also need to address the issue with customizing the tracer with the Vert.x Builder. I'll take care of it.

[ZenLiuCN]

Thanks @ZenLiuCN

Yes, this is required. But we also need to address the issue with customizing the tracer with the Vert.x Builder. I'll take care of it.

Expect the result. Current can only use javadoc legacy mode to skip this condition

[tsegismont]

Superseded by #98