util: add traceback function that i stole

https://discord.com/channels/805969743466332191/827848307480461313/1120318388540022794

it was in a fucking shitpost channel
thanks again @dragekk this is probably the fifth thing i've stolen from
you

timers.lua

@@ -33,7 +33,7 @@ do
 	--it can be overwritten.
 	---@param ticks integer Number of ticks to wait
 	---@param next function Callback to run
-	---@param name function Name of callback
+	---@param name string Name of callback
 	function namedWait(ticks, next, name)
 		-- main difference, this will overwrite an existing timer with
 		-- the same name

util.lua

@@ -204,4 +204,8 @@ local function recurseModelGroup(group)
 end
 util.recurseModelGroup=recurseModelGroup
 
+function util.traceback()
+    return ({pcall(function() error("", 4) end)})[2]:match("stack traceback:.+$")
+end
+
 return util