Enable cache directives on GraphQL schema

[Voxelot]

Much of the data on the graphql api is highly cachable as it's immutable once written. There is an Apollo graphql standard for this that many CDNs support: https://www.apollographql.com/docs/apollo-server/performance/caching

Our async-graphql framework also supports adding these annotations: https://async-graphql.github.io/async-graphql/en/cache_control.html

By decorating our GraphQL API with these caching annotations, we will be able to drastically speed up the performance of historical queries on the GraphQL API at the CDN level.