Request to allow mutiline `@type` values

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

---@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:

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

該 issue 未提供檔案或測試進入點。先定位對 @type 值的註解處理，然後為所示的多行形式新增測試涵蓋，並確認其結構化型別與單行形式以相同方式解析。