Support for AddingSpanAttributes

[brunobat]

Resolves #36138

Annotating a method in any CDI aware bean with the io.opentelemetry.instrumentation.annotations.AddingSpanAttributes will not create a new span but will add annotated method parameters to attributes in the current span.

If a method is annotated by mistake with @AddingSpanAttributes and @WithSpan annotations, the @WithSpan annotation will take precedence.

[quarkus-bot]

/cc @radcortez (opentelemetry)

[brunobat]

cc @ennishol

[github-actions]

🙈 The PR is closed and the preview is expired.

[quarkus-bot]

✔️ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

[geoand]

Just curious but wouldn't it be better to make

If a method is annotated by mistake with @AddingSpanAttributes and @WithSpan annotations, the @WithSpan annotation will take precedence.

an error instead?

[brunobat]

It could @geoand , but the OTel instrumentation tests assume this priority and I wanted to keep it consistent.
See: https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/540b9fbb9868c23033e3c7b2a5c247d2695cb279/instrumentation/opentelemetry-instrumentation-annotations-1.16/javaagent/src/test/java/io/opentelemetry/test/annotation/ExtractAttributesUsingAddingSpanAttributes.java#L36

[geoand]

Gotcha, thanks