Add Neon access review driver support

Register Neon as a connector provider and add a new access review
driver that fetches organization members from the Neon API with
cursor-based pagination.

Neon's OAuth is partner-gated, so the connector is API-key only
(Bearer, the default scheme). A personal or organization API key can
belong to several organizations; the operator supplies the ID of the
one to review. The members endpoint exposes per-user MFA state
(has_mfa) and deactivation, which map to the access entry MFA status
and active flag; the stable account UUID (user_id) is used as the
external ID over the membership ID.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/server/api/console/v1/graphql/connector.graphql

@@ -70,6 +70,7 @@ enum ConnectorProvider
     ZENDESK @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderZendesk")
     QOVERY @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderQovery")
     RENDER @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderRender")
+    NEON @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderNeon")
 }
 
 type ConnectorProviderInfo {
@@ -150,6 +151,7 @@ input CreateAPIKeyConnectorInput {
     betterStackTeamName: String
     qoveryOrganizationId: String
     renderWorkspaceId: String
+    neonOrganizationId: String
 }
 
 type CreateAPIKeyConnectorPayload {