[Feature Request] Integrate logging and notification services

[Time1ess]

Please describe the problem you want to solve.
Our code lacks logging, which is a disaster for debugging, necessary logging is required. Users get no updates about the status of their training records.

Describe the solution you'd like
Loggers should be used. More specifically, infra.utils.prod_logger and infra.utils.dev_logger are used to log useful messages in production environment and development environment respectively. infra.services.NotificationService is used to send notifications which should be embedded into our business logic to send notifications.

[eyeeco]

关于本issue给大家一写参考

1. Notification
   这一部分指如果业务逻辑涉及到了“互动性操作“， 例如管理员A将用户B加入到了某个组，该动作的发生与该用户有关，但是并非该用户直接操作。涉及到的地方需要重写add、delete、update 等方法，重写时加入infra.services.NotificationService 的 send_system_notification(recipient, content) 函数，该函数接受一个用户实例或ID和通知内容。

2. Logger
   这一部分主要指Service中涉及到的函数，给其加上相应的日志，供后台维护使用。
   使用方法例如 prod_logger.info('something')

本任务按照模块划分，我负责auth部分，其他部分自己认领。
值得注意的，增加权限系统时我增加了很多service，大家根据需要在这个基础上加上相应的notification或logger即可。