Feature request: Infer overload annotations for subsequent overloads

It would be useful for subsequent function overload definitions to use prior annotations unless a new annotation is provided.

Such as:

---An example function
---@param a integer
---@param b string
---@param c function Some documentation about c
---@return boolean
---@overload fun(c)
---@overload fun(a): nil
function foo(a, b, c) end

being equivalent to

---An example function
---@param a integer
---@param b string
---@param c function Some documentation about c
---@return boolean
function foo(a, b, c) end

---An example function
---@param c function Some documentation about c
---@return boolean
function foo(c)

---An example function
---@param a integer
---@return nil
function foo(a)

With auto-generated documentation this isn't so much of a problem, but it's a bit of a chore when it's something to be done by hand.

Appreciate all the work you've done! This makes writing Lua so much more confident.

issue 中没有指定文件或测试。首先定位 @overload 以及参数/返回值注解的处理位置，然后为继承之前的注解，以及在 overload 提供新注解时覆盖之前的注解，添加有针对性的覆盖。完成的标准是：示例中的两个 overload 获得文档所述的继承注解和显式注解，同时不改变原始定义。