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/AI/Operators/Generic/WaitOperator.cs

@@ -0,0 +1,24 @@
+namespace Content.Server.AI.Operators.Generic
+{
+    public class WaitOperator : AiOperator
+    {
+        private readonly float _waitTime;
+        private float _accumulatedTime = 0.0f;
+
+        public WaitOperator(float waitTime)
+        {
+            _waitTime = waitTime;
+        }
+
+        public override Outcome Execute(float frameTime)
+        {
+            if (_accumulatedTime < _waitTime)
+            {
+                _accumulatedTime += frameTime;
+                return Outcome.Continuing;
+            }
+
+            return Outcome.Success;
+        }
+    }
+}