Open door for CLI to consume config file that autorest understands

As of today the CLI takes individual swagger and resolves it to pass it along to the breaking change tool. As autorest input is very flexible in also consuming the config files, we should allow the consumption of config files as well

**cc**
@olydis 👍 Thanks for pointing this out

首先，追蹤 CLI 目前如何接受個別的 Swagger 規格，並將其傳遞給 breaking change 工具。檢視 AutoRest 設定檔的表示與解析方式，接著驗證 CLI 是否能夠使用此類設定，並透過現有流程傳遞由此產生的規格。

由索引模型根據 Issue 內容生成。