Human inspired follow distance (#22937)

* Add cost for creep

* more reasonable cost

* seems better than before

* science tune

* more chill

* closer follow

* stopping takes some leeway

* better cruise

* needed to be cumsum all along

* jerk not even needed

* matches better

* 6 is too much

* add back

* a little extra buffer is good for badly tuned cars

* new refs

* refs again
old-commit-hash: 46fd5892bf

selfdrive/test/process_replay/ref_commit

@@ -1 +1 @@
-e15e446543ea74cce4864f07902a39bdb8b10688
+fb4318e66ce98c9bc267b0778d9238265c1c5b17