Support typedef

I need a way to shorten some type define.

For example, I have two variables defined like this:

---@type fun(result_count:number, result_map:Map<number,Map<number,table>>) | nil
local entity_search_result_callback1
---@type fun(result_count:number, result_map:Map<number,Map<number,table>>) | nil
local entity_search_result_callback2

Hard to write and understand! 😭

I want to do this:

---@typedef entity_id_t number
---@typedef component_id_t number
---@typedef entity_data_t Map<component_id_t,table>
---@typedef entity_data_map_t Map<entity_id_t,entity_data_t>
---@typedef success_callback_t  fun(result_count:number, result_map:entity_data_map_t) | nil

---@type success_callback_t
local entity_search_result_callback1
---@type success_callback_t
local entity_search_result_callback2

😎

[tangzx]

new annotation: @alias usage: ---@alias NAME type

---@alias EventListener fun(type: string):void

---@param listener  EventListener
function m:addEventListener(listener)
end

[ice1000]

---@class entity_id_t : number
---@class component_id_t : number
---@class entity_data_t : Map<component_id_t,table>
---@class entity_data_map_t : Map<entity_id_t,entity_data_t>
---@class success_callback_t : fun(result_count:number, result_map:entity_data_map_t) | nil

---@type success_callback_t
local entity_search_result_callback1
---@type success_callback_t
local entity_search_result_callback2