Returning a value as a class doesnt set the fields

### 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, Type Checking

### Expected Behaviour

`value` be member of `MyClass`

### Actual Behaviour

`value` is not a member

### Reproduction steps

```lua
local function myConstructor()
---@class MyClass
return { value = true }
end

local o = myConstructor()
print(o.value)
```

### Additional Notes

This should also work with a `setmetatable` variant:

```lua
---@class MyClass
local MyClass = {}
MyClass.__index = MyClass

local function myConstructor()
---@class MyClass
return setmetatable({ value = true }, MyClass)
end

local o = myConstructor()
print(o.value)
```

It does work with this workarround:

```lua
local function myConstructor()
---@class MyClass
local o = setmetatable({ value = true }, MyClass)
return o
end
```

### Log File

_No response_

Start by reproducing the two constructor examples from the issue and trace how the language server interprets the @class annotation on a returned table. Compare this with the working local-variable workaround and add a regression test covering both direct returns and setmetatable returns. Done means value is recognized as a member of MyClass during type checking.

Written by the indexing model from the issue text.