Refactor pathfinding updates and add AccessReader support (#1183)

There was some extra bloat in the path graph updates.
Now the queue should also just run if it gets too big regardless.
Un-anchored physics objects are no longer a hard fail for pathfinding.
Add AccessReader support so open / close doors show up for pathfinding
AI also ensure they call the operator's shutdown when they're shutdown so that should cancel the pathfinding job.

I tried to split these into 2 commits but they were kinda coupled together

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/AI/Utility/AiLogic/UtilityAI.cs

@@ -126,6 +126,9 @@ namespace Content.Server.AI.Utility.AiLogic
             {
                 damageableComponent.DamageThresholdPassed -= DeathHandle;
             }
+
+            var currentOp = CurrentAction?.ActionOperators.Peek();
+            currentOp?.Shutdown(Outcome.Failed);
         }
 
         private void DeathHandle(object sender, DamageThresholdPassedEventArgs eventArgs)