Plug for resolving tenant context from the request.
Place this plug AFTER ScimAuth in the pipeline. It calls the configured
ExScim.Tenant.Resolver to determine the tenant, then sets scope.tenant_id.
When no resolver is configured, this plug is a no-op.
Configuration
config :ex_scim, tenant_resolver: MyApp.TenantResolverPipeline example
pipeline :scim do
plug ExScimPhoenix.Plugs.ScimAuth
plug ExScimPhoenix.Plugs.ScimTenant
end