Docs: GraphQL query hashing

[Rachael-Graham]

Version

master

Describe the requested changes

Need GraphQL docs on query hashing. Include CDN cache control headers capability.

Link to any relevant existing docs

• GG caching - we dont use the same CRs in Edge of course, but helpful conceptual info: https://docs.solo.io/gloo-gateway/main/graphql/graphql-persisted-query-cache/
• Automatic persisted queries: https://github.com/solo-io/envoy-gloo-ee/issues/272
• Response Caching: This is basically piggybacking on the general response caching support we’re doing for Edge https://github.com/solo-io/envoy-gloo-ee/issues/260
• CDN cache control headers PR: https://github.com/solo-io/envoy-gloo-ee/pull/288

Browser Information

No response

Additional Context

No response

[github-actions[bot]]

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