Feature for Lua 5.4 to warn about unused __close metamethods.

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?

MacOS

### What is the issue affecting?

Annotations

### Expected Behaviour

I think it would make sense to be able to somehow annotate that a table with a __close metamethod is meant to be used as a local variable with lua 5.4's attribute. This would be useful for raii-like constructs.

### Actual Behaviour

No warning.

### Reproduction steps

Example:

```lua

local function get_resource()
return
setmetatable({}, {
__close = function ()
print('close resource')
end
})
end

local a = get_resource() -- ok

local b = get_resource() -- not okay, should somehow warn
```

### Additional Notes

_No response_

### Log File

_No response_

從 Lua 5.4 的 行為和提供的 get_resource 重現開始。確定語言伺服器如何表示註解和警告，然後定義一種識別帶有 __close 但在沒有 的情況下被指派的資源的方法；完成標準是範例對 b 發出警告，同時接受 a。

由索引模型根據 Issue 內容生成。