Add a structured output format for actions

Currently the ospo-actions each make human readable reports, but it'd be beneficial to enable structured output like JSON which could get POSTed to a url. Users who are using an external system for logging or auditing could then parse the result and make use of the data for alerts, visualizations, etc.

首先阅读 ospo-actions 当前如何组装人类可读的报告，以及如何处理 action 的输入和输出。定义结构化 JSON 数据和 POST 行为，然后验证外部日志记录或审计系统能否解析结果，并将其用于告警或可视化。

由索引模型根据 Issue 内容生成。