Zy0n made one a while ago and there is one for PC that's like nazi zombies.There are no such patches. Not with what you want anyway. You can add bots to any old patch, but they wont be tracking you down like in nazi zombies. The problem comes when you have to program in a sort of artificial intelligence for object detection and routes. I remember someone saying they were working on it but as far as I know it was never released.
TL;DR - doesnt exist (to my knowledge)