NPC refactor (#10122)

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

Content.Server/NPC/Components/NPCComponent.cs

@@ -0,0 +1,13 @@
+using Content.Shared.NPC;
+
+namespace Content.Server.NPC.Components
+{
+    public abstract class NPCComponent : SharedNPCComponent
+    {
+        /// <summary>
+        /// Contains all of the world data for a particular NPC in terms of how it sees the world.
+        /// </summary>
+        [ViewVariables, DataField("blackboard", customTypeSerializer: typeof(NPCBlackboardSerializer))]
+        public NPCBlackboard Blackboard = new();
+    }
+}