router

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Current plan

Implement defer only for now, in the router, with some query planner modification.

@defer RFC

Related issues:

• #1178
• #1179
• #1180
• #1181

To be defined:

• response stream format: right now the stream is apparent in all signatures, maybe we could have instead response types that holds the headers then a (generic) stream of graphql responses
• adapting telemetry: telemetry now registers one operation per response (deferred or not), that might not be what we want in the end. But also, telemetry does not really have a concept of deferred responses

I've changed this issue to just be about @defer. We can still think about @stream support in that design, but the outcome might just be @defer. 😜

This is done via a lot of tickets.