Is it possible to annotate nodiscard for fields of a class?

還沒有人認領這個 Issue。

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Annotations

### Expected Behaviour

I hope there is a way to annotate that a `field` of a `class` is a `@nodiscard` `function`.

### Actual Behaviour

currently there is no way to annotate that a `field` of a `class` is `@nodiscard`

### Reproduction steps

1. Go to your code editor and write a class, for example:
```lua
---@class Item
---@field getPosition fun(self: Item): table
Item = {}
```

2. Try annotate getPosition `field` as `@nodiscard`

### Additional Notes

_No response_

### Log File

_No response_

首先追蹤 language server 如何解析並套用 @class 與 @field 註解，然後將這條路徑與其現有的 @nodiscard 處理方式進行比較。定義型別為函式的類別欄位之註解語法，並驗證該欄位產生的未使用結果會產生預期的診斷資訊。

由索引模型根據 Issue 內容生成。