Extract @cost and @listSize to query planner's subgraph schemas

[tninesling]

This PR follows up on apollographql/federation#3074, which defined the new @cost and @listSize directives. These will be used by the demand control plugin to score the cost of operations. In the scoring algorithm, the plugin scores FetchNodes in the query plan based on their respective subgraph schemas. This means those extracted subgraph schemas must include these directives, which are copied over from the supergraph.

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Checklist

Complete the checklist (and note appropriate exceptions) before the PR is marked ready-for-review.

• Changes are compatible¹
• Documentation² completed
• Performance impact assessed and acceptable
• Tests added and passing³
  • Unit Tests
  • Integration Tests
  • Manual Tests

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Notes

Footnotes

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2. Configuration is an important part of many changes. Where applicable please try to document configuration examples. ↩

3. Tick whichever testing boxes are applicable. If you are adding Manual Tests, please document the manual testing (extensively) in the Exceptions. ↩

[github-actions]

@tninesling, please consider creating a changeset entry in /.changesets/. These instructions describe the process and tooling.

[router-perf]

CI performance tests

• const - Basic stress test that runs with a constant number of users
• demand-control-instrumented - A copy of the step test, but with demand control monitoring and metrics enabled
• demand-control-uninstrumented - A copy of the step test, but with demand control monitoring enabled
• enhanced-signature - Enhanced signature enabled
• events - Stress test for events with a lot of users and deduplication ENABLED
• events_big_cap_high_rate - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity
• events_big_cap_high_rate_callback - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity using callback mode
• events_callback - Stress test for events with a lot of users and deduplication ENABLED in callback mode
• events_without_dedup - Stress test for events with a lot of users and deduplication DISABLED
• events_without_dedup_callback - Stress test for events with a lot of users and deduplication DISABLED using callback mode
• extended-reference-mode - Extended reference mode enabled
• large-request - Stress test with a 1 MB request payload
• no-tracing - Basic stress test, no tracing
• reload - Reload test over a long period of time at a constant rate of users
• step-jemalloc-tuning - Clone of the basic stress test for jemalloc tuning
• step-local-metrics - Field stats that are generated from the router rather than FTV1
• step-with-prometheus - A copy of the step test with the Prometheus metrics exporter enabled
• step - Basic stress test that steps up the number of users over time
• xlarge-request - Stress test with 10 MB request payload
• xxlarge-request - Stress test with 100 MB request payload

[lrlna]

This is looking good! Thank you for making sure it's right away added to the rust implementation!

The only change I'd like to ask for is adding Object and Scalar types with @cost to the two tests you've got here. Otherwise a few clarification comments/questions.

[lrlna]

I am away this next week and don’t want to block you from merging this. The only thing that's important before merging is using the Object Type Definition and the Scalar Type Definiton with @cost in a test.

[tninesling]

I am away this next week and don’t want to block you from merging this. The only thing that's important before merging is using the Object Type Definition and the Scalar Type Definiton with @cost in a test.

Thanks, Iryna. This was a great catch, and made me realize I need an equivalent patch for the JS version