originforest service auth middleware in bpframework.

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https://github.com/bpcloud/middleware

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#### Setup.

``js
import { Application } from 'bpframework';
import * as middleware_auth from '@bpframework/middleware-auth';

Application.use(middleware_auth.middleware)
Application.runKoa(...);
`

#### Config.

`properties
spring:
application: xxxxxxxxx # 服务名字

service_sign:
faas_service_sign: xxxxxxxxx # 服务签名
``