Way to annotate `@overload` only table, instead of the entire `@class`

---@class Class
---@overload fun(): self|Class
local Class = {}

local c = Class()

local unknown = c() -- but unknown is Class

I thought that was the indication self/Class was responsible for this

self for object
Class for table

But today I discovered that this is not so.
And in previous versions as well

In principle, this can be achieved by explicitly making

---@cast Class Class|fun(): Class

But for long names it is extremely monstrous

在 language server 中复现 issue 的 Lua 代码片段，并跟踪 @class 和 @overload 注解的解释方式。确定如何将 overload 应用于类表而不改变实例类型，然后为该示例添加覆盖，并验证 unknown 的推断类型为 Class。