Extension of shouldCreateSpanForRequest to cover usual cases

### Problem Statement

Right now the `shouldCreateSpanForRequest` callback could be helpful to distinguish between API endpoints and decide whether a request should be decorated with the distributed tracing headers. Besides just having the URL at hand to make a decision, it would be helpful to provide some more request specific information – especially the HTTP method. That would help to only send the tracing headers to API methods that could deal with those.

### Solution Brainstorm

Extend the `shouldCreateSpanForRequest` by an additional parameter providing at least the HTTP method.