Initialize all the rules from the configuration file

Class [ComparisonMessages](https://github.com/Azure/openapi-diff/blob/master/openapi-diff/src/modeler/AutoRest.Swagger/ComparisonMessages.cs#L3) should be initialized from the json file for all the rules.

- [ ] Initialization from config file
- [ ] Categorization from config file
- [ ] Run tools in context (Azure v/s NonAzure, SDK v/s NonSDK)
- [ ] Initialize the severity from the config file
- [ ] Generate documentation from master list of rules

从 ComparisonMessages.cs 开始，找到项目使用的 JSON 配置文件。跟踪当前的规则初始化流程，然后使用检查清单定义完成标准：配置驱动的初始化、分类、特定上下文的工具、严重性，以及根据主规则列表编写文档。

由索引模型根据 Issue 内容生成。