Outline view does not show props of typescript type

还没有人认领这个 Issue。

### 🔍 Search Terms

tsserver type outline view

### ✅ Viability Checklist

- [x] This wouldn't be a breaking change in existing TypeScript/JavaScript code
- [x] This wouldn't change the runtime behavior of existing JavaScript code
- [x] This could be implemented without emitting different JS based on the types of the expressions
- [x] This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
- [x] This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
- [x] This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

### ⭐ Suggestion

When using typescript `interface` instead of `type`:

```
export interface User {
id?: string | undefined;
username: string;
}
```

the props are shown in the editor's `Outline view`.

However, when I have a typical typescript `type`:

```
export type User = {
id?: string | undefined;
username: string;
}
```

the props are not shown in the `Outline view` (e.g. VSCode or Eclipse Editor Outline View)

Please show the props in the `Ouline view` also for typescript `type`.

This issue was previously created on other repos and delegated to this repo:
- See https://github.com/eclipse-wildwebdeveloper/wildwebdeveloper/issues/1753#issuecomment-2919335238 for more information.
- See https://github.com/typescript-language-server/typescript-language-server/issues/960#issuecomment-3154878653

### 📃 Motivating Example

Show the props in the `Ouline view` also for typescript `type`.

### 💻 Use Cases

1. What do you want to use this for? for outline view
3. What shortcomings exist with current approaches? properties in the `Ouline view` does not appear for typescript `type`
4. What workarounds are you using in the meantime? nothing

未指定源文件或测试。首先调查 tsserver 对 document-symbol 或 outline 的处理，并比较 issue 中 interface 和 type 示例生成的符号。完成标准是 type alias 的属性像 interface 的属性一样出现在编辑器的 Outline 视图中。

由索引模型根据 Issue 内容生成。