Request to allow mutiline `@type` values

还没有人认领这个 Issue。

Sometimes, a `@type` value can be very long, i.e.

```lua
---@type {filepath: string?, type: 'unknown'|'binary'|'stock'|'path', loader: function}
```

Of course, while I could clean-up the above by replacing `type` with its own alias, I still think it would be nice to be able to do this:

```lua
---@type {
--- filepath: string?,
--- type: 'unknown'|'binary'|'stock'|'path',
--- loader: function
---}
```

该 issue 未提供文件或测试入口点。先定位对 @type 值的注解处理，然后为所示的多行形式添加测试覆盖，并确认其结构化类型与单行形式以相同方式解析。

由索引模型根据 Issue 内容生成。