Expose throttled_until throttled_at to API users

app/serializers/device_serializer.rb

@@ -1,4 +1,4 @@
 class DeviceSerializer < ActiveModel::Serializer
   attributes :id, :name, :timezone, :last_saw_api, :last_saw_mq, :tz_offset_hrs,
-             :fbos_version
+             :fbos_version, :throttled_until, :throttled_at
 end

webpack/devices/interfaces.ts

@@ -76,6 +76,8 @@ export interface DeviceAccountSettings {
   name: string;
   timezone?: string | undefined;
   tz_offset_hrs: number;
+  throttled_until?: string;
+  throttled_at?: string;
   fbos_version?: string | undefined;
   last_saw_api?: string | undefined;
   last_saw_mq?: string | undefined;