add missing luals fields to GameObject

obj/GameObject.lua

@@ -6,6 +6,10 @@
 ---@field y number
 ---@field opts table|nil
 ---@field super GameObject
+---@field id string
+---@field dead boolean
+---@field timer Timer
+---@field collider table|nil
 local GameObject = Object:extend()
 
 ---Instantiates game object