This PR refactors the schema crate to enable overriding the
interpretation of roles at runtime.
By providing a `NamespacedGetter` that ignores roles entirely (i.e.
`GDSNamespacedGetterAgnostic`) to schema generation functions it is
possible to derive a GraphQL schema that ignores permissions and
presets.
This PR leaves back a few opportunities to improve code clarity, which I
hope to address in follow-up PRs.
For instance, it seems superfluous to make sense for generic code
parametrised `<S: SchemaContext>` to carry around both a `S::Namespace`
and a `S::NamespaceGetter`, when all that code could ever do with that
`S::Namespace` value anyway is apply it to the `S::NamespaceGetter`.
Taking this line of reasoning to its conclusion suggests that we can
reduce the complexity of `trait SchemaContext` and its associated types
and kit.
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Co-authored-by: Samir Talwar <samir.talwar@hasura.io>
V3_GIT_ORIGIN_REV_ID: c84555fd88279582670919faa5a62bbd00b714bd
