NPC utility queries (#15843)

Content.Server/NPC/HTN/PrimitiveTasks/HTNPrimitiveTask.cs

@@ -1,4 +1,5 @@
 using Content.Server.NPC.HTN.Preconditions;
+using Content.Server.NPC.Queries;
 using Robust.Shared.Prototypes;
 
 namespace Content.Server.NPC.HTN.PrimitiveTasks;
@@ -19,4 +20,9 @@ public sealed class HTNPrimitiveTask : HTNTask
     [DataField("preconditions")] public List<HTNPrecondition> Preconditions = new();
 
     [DataField("operator", required:true)] public HTNOperator Operator = default!;
+
+    /// <summary>
+    /// Services actively tick and can potentially update keys, such as combat target.
+    /// </summary>
+    [DataField("services")] public List<UtilityService> Services = new();
 }