Opentelemetry: Option to pass context

[simonstumpf]

We would like to monitor our services with Opentelemetry.
In order to make this possible, it should be possible to pass the current context to the services calls (GetRepository e.g.).

Describe the solution you'd like to see
Support for passing the context to service calls

With the client-go library for kubernetes, for example, this is possible:

namespaces, err := kubeclient.Client.CoreV1().Namespaces().List(c.Request.Context(), metav1.ListOptions{})