create waitForSharedLoad() function

This my attempt to aid ESX loading, essentially my scripts server side now need to be locked behind `onResourceStart()` because of ESX

Loading ESX into my scripts was delaying half of it and breaking the other half

This function forcibly waits until everythings loaded and then continues

This shouldn't affect other frameworks loading ability

My tests so far have been a success with it

shared/helpers.lua

@@ -262,7 +262,7 @@ end
 --- ```
 function countTable(tbl)
     local i = 0
-    for _ in pairs(tbl) do i = i + 1 end
+    for _ in pairs(tbl) do i += 1 end
     return i
 end