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

Nobody has claimed this yet.

### 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_

Start by tracing how the language server parses and applies @class and @field annotations, then compare that path with its existing handling of @nodiscard. Define the annotation syntax for a class field whose type is a function, and verify that unused results from that field produce the expected diagnostic.

Written by the indexing model from the issue text.