Move Identity, Organization, Viewer, PageInfo, OrderDirection,
CountryCode, OIDCProviderInfo, File, and ReauthenticationReason out
of base.graphql into their own dedicated files across all three APIs.
base.graphql now only contains directives, scalars, Node interface,
Query type, and an empty Mutation type (required by Relay
schemaExtensions). Entity files use extend type Mutation for their
mutations.
Signed-off-by: Émile Ré <emile@getprobo.com>
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