Add utility AI (#806)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>
Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Server/GameObjects/EntitySystems/AI/LoadBalancer/AiActionSystem.cs

@@ -0,0 +1,28 @@
+using System.Threading;
+using Content.Server.GameObjects.EntitySystems.JobQueues.Queues;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.EntitySystems.AI.LoadBalancer
+{
+    /// <summary>
+    /// This will queue up an AI's request for an action and give it one when possible
+    /// </summary>
+    public class AiActionSystem : EntitySystem
+    {
+        private readonly AiActionJobQueue _aiRequestQueue = new AiActionJobQueue();
+
+        public AiActionRequestJob RequestAction(AiActionRequest request, CancellationTokenSource cancellationToken)
+        {
+            var job = new AiActionRequestJob(0.002, request, cancellationToken.Token);
+            // AI should already know if it shouldn't request again
+            _aiRequestQueue.EnqueueJob(job);
+            return job;
+        }
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+            _aiRequestQueue.Process();
+        }
+    }
+}