Show underlying Types of alias Types

This is a mirror of my issue for the ionide vscode extension. I was told here would be a more appropriate place to ask
https://github.com/ionide/ionide-vscode-fsharp/issues/1417

Its very annoying when i make types alias's for ease of documentation/domain modeling and it then completely obscures what the underlying type actually is.

I would like an option to show the underlying types of aliases both in intellisense popups/hovering and also in the inline auto-generated type annotations

Example
```fsharp
type id = int
type location= id list
type hierarchy= Dictionary
```
I think a good idea for type annotations and intellisene displaying would be something along these lines
```fsharp
| alias |{ underlying type alias v alias v }
hierarchy{Dictionary}
```
or even just one level deep like:
```fsharp
| alias | { underlying type }
hierarchy{Dictionary}
```

首先查看镜像的 Ionide VS Code issue，以及现有的 IntelliSense 悬停/弹出窗口和内联类型注释入口点。明确 alias 应展开到多深，以及该选项应如何影响这两个界面。完成标准是用户可以选择在这两种上下文中查看 alias 的底层类型。

由索引模型根据 Issue 内容生成。