Split GraphQL schemas into per-entity files

Split each API's monolithic schema.graphql into per-coredata-model
files under graphql/ subdirectories. gqlgen's follow-schema layout
with {name}.resolvers.go template generates one resolver file per
schema file. Relay uses schema + schemaExtensions to load the split
files.

Connect API: 8 files (base, session, organization, profile,
personal_api_key, saml, scim, audit_log)

Trust API: 5 files (base, trust_center, auth, nda, mailing_list)

Console API: 25 files covering all domain entities

Types extended across files (Organization, Mutation, Viewer,
TrustCenter, Identity) are defined in base.graphql as required by
Relay's schemaExtensions.

Signed-off-by: Émile Ré <emile@getprobo.com>

relay.config.json

@@ -7,7 +7,8 @@
   },
   "projects": {
     "core": {
-      "schema": "pkg/server/api/console/v1/schema.graphql",
+      "schema": "pkg/server/api/console/v1/graphql/base.graphql",
+      "schemaExtensions": ["pkg/server/api/console/v1/graphql"],
       "language": "typescript",
       "noFutureProofEnums": true,
       "output": "apps/console/src/__generated__/core",
@@ -22,7 +23,8 @@
       }
     },
     "iam": {
-      "schema": "pkg/server/api/connect/v1/schema.graphql",
+      "schema": "pkg/server/api/connect/v1/graphql/base.graphql",
+      "schemaExtensions": ["pkg/server/api/connect/v1/graphql"],
       "language": "typescript",
       "noFutureProofEnums": true,
       "output": "apps/console/src/__generated__/iam",
@@ -37,7 +39,8 @@
       }
     },
     "trust": {
-      "schema": "pkg/server/api/trust/v1/schema.graphql",
+      "schema": "pkg/server/api/trust/v1/graphql/base.graphql",
+      "schemaExtensions": ["pkg/server/api/trust/v1/graphql"],
       "language": "typescript",
       "noFutureProofEnums": true,
       "customScalarTypes": {