feat(api): expose family settings (#1645)

* feat(api): expose family settings

* test(api): assert family settings moniker

* test(api): align family settings api key helper

* fix(api): tighten family settings schema

app/controllers/api/v1/family_settings_controller.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class Api::V1::FamilySettingsController < Api::V1::BaseController
+  before_action :ensure_read_scope
+
+  def show
+    @family = current_resource_owner.family
+  end
+
+  private
+
+    def ensure_read_scope
+      authorize_scope!(:read)
+    end
+end