`assign-type-mismatch` warning when overloading a derived class

还没有人认领这个 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, Type Checking, Diagnostics/Syntax Checking

### Expected Behaviour

No warning generated.

### Actual Behaviour

An `assign-type-mismatch` warning is thrown.

### Reproduction steps

```lua
---@class Parent

---@return Parent
local function newParent() local o = {}; return setmetatable(o, o) end

---@class Object : Parent
---@overload fun(s: string) -- Or disable the diagnostic on this line
local o = newParent() -- Invalid warning here

function o:__call() end
```

### Additional Notes

The overload workaround, mentioned in #1733 does not work in this use case. A function returns a type, from which a new class is created. When overloading this new class, an invalid warning is generated.

ℹ️ A workaround I've found is to make the class derive also from `table`:
```diff
- ---@class Parent
+ ---@class Parent : table
```

### Log File

_No response_

在 Visual Studio Code 扩展中复现 Lua 代码片段的警告，重点关注将 `@overload` 应用于函数返回的类时的 `assign-type-mismatch` 诊断。跟踪 `@class` 继承和重载的处理，然后验证复现不再发出无效警告，同时保留文档所述的 `table` workaround 行为。

由索引模型根据 Issue 内容生成。