router

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Related to #1198 but enable it for spans

example of configuration:

telemetry:
  tracing: 
    common:
      resources:      
        router: # from router_service
          static:
            - name: "version"
              value: "v1.0.0"
          request:
            - header:
                named: "content-type"
                rename: "payload_type"
                default: "application/json"
            - header:
                named: "x-custom-header-to-add"
          response:
            - body:
                path: errors.extensions.status
                name: extended_status
                default: optional_default_value
          context:
            - named: "foo"
          
        subgraph:
          all:
            static:
              - name: "version"
                value: "v1.0.0"
              request:
                - header:
                    named: "content-type"
                    rename: "payload_type"
                    default: "application/json"
                - header:
                    named: "x-custom-header-to-add"
              response:
                - body:
                    path: errors.extensions.status
                    name: extended_status
                    default: optional_default_value
              context:
                - named: "foo"
          subgraphs: # from subgraph_service
            products:
              static:
                - name: "version"
                  value: "v1.0.0"
                request:
                  - header:
                      named: "content-type"
                      rename: "payload_type"
                      default: "application/json"
                  - header:
                      named: "x-custom-header-to-add"
                response:
                  - body:
                      path: errors.extensions.status
                      name: extended_status
                      default: optional_default_value
                context:
                  - named: "foo"