Attach a unique request ID in a header such as `X-Request-Id` and pass to subgraphs

[rickpasetto]

Component(s)

No response

Is your feature request related to a problem? Please describe.

We have a need to be able to associate federated subgraph requests in a common place -- in shared logs, in particular. When subgraph services all log to a common place, it would be very helpful to associate them with a single client-server operation for debugging and other purposes.

Describe the solution you'd like

To achieve this, the proposal is to add a request ID that is unique per GraphQL operation on the supergraph, and passed along to each of the subgraphs in the form of an HTTP header such as X-Request-Id. (I'm not strongly opinionated about this specific header, so if you have a more standard name that'd be fine, as long as it is documented.). This request ID needs to be unique and maintained across the entire client -> server response. (It might be a good idea to pass this ID back in the response as well, although that's optional with respect to our specific need.)

Describe alternatives you've considered

It has been suggested that we use the Traceparent header which contains a trace ID and other information. I think that X-Request-Id is a simpler alternative.

Additional context

No response

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