Suggestion: add-on recommendations in settings

还没有人认领这个 Issue。

VS Code has workspace recommendations, which is a nice way to get a project up and running quickly after cloning a repo. The user is notified of recommended extensions and can quickly install them.

I think it would be nice if the VS Code add-on for LuaLS would support the same. Perhaps settings could be extended with something like:

```json
{
"properties": {
"workspace": {
"recommendations": ["love2d"]
}
}
}
```

And then after installing the LuaLS extension, a window could pop-up showing the recommended add-on(s), to be installed with the click of a button.

首先定位扩展清单和与设置相关的入口点，然后确认 VS Code 如何表示工作区扩展建议和安装提示。定义受支持的建议格式和提示行为，当建议在克隆的工作区中显示并可安装时，即表示完成。

由索引模型根据 Issue 内容生成。