Feature for Lua 5.4 to warn about unused __close metamethods.

Nobody has claimed this yet.

### 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_

Start with the Lua 5.4 behavior and the provided get_resource reproduction. Determine how the language server represents annotations and warnings, then define a way to identify resources with __close that are assigned without ; done means the example warns for b while accepting a.

Written by the indexing model from the issue text.