Help wanted! Add `code.*` attributes to controller spans

[trask]

Capture code.namespace and code.function on controller and view spans (not sure what to do with view spans yet, see discussion at #12984 (comment)).

Controller spans:

• dropwizard/dropwizard-views-0.7
• grails-3.0
• jaxrs/jaxrs-1.0
• jaxrs/jaxrs-2.0/jaxrs-2.0-annotations
• jaxrs/jaxrs-3.0/jaxrs-3.0-annotations
• jaxrs/jaxrs-common
• jaxws/jaxws-2.0-axis2-1.6
• jaxws/jaxws-common
• jaxws/jaxws-cxf-3.0
• jaxws/jaxws-jws-api-1.1
• jaxws/jaxws-metro-2.2
• jsf/jsf-mojarra-1.2
• jsf/jsf-mojarra-3.0
• jsf/jsf-myfaces-1.2
• jsf/jsf-myfaces-3.0
• play/play-mvc/play-mvc-2.4
• ratpack/ratpack-1.4
• spring/spring-webflux/spring-webflux-5.0
• spring/spring-webmvc/spring-webmvc-common Add code attributes to spring webmvc controller spans #12839
• spring/spring-ws-2.0
• struts-2.3
• tapestry-5.4
• vaadin-14.2

View spans:

• jsp-2.3
• spring/spring-webmvc/spring-webmvc-common

[arik-dig]

@trask I can take this task and start with JAX-RS Controllers and Spring-MVC Controllers.
Do I have your blessing?

[trask]

👍

[arik-dig]

@trask sorry, but seems that due to time constraints I won't be able to address it soon.