NPC refactor (#10122)

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

Content.Server/NPC/Pathfinding/GridPathfindingComponent.cs

@@ -0,0 +1,8 @@
+namespace Content.Server.NPC.Pathfinding;
+
+[RegisterComponent]
+[Access(typeof(PathfindingSystem))]
+public sealed class GridPathfindingComponent : Component
+{
+    public readonly Dictionary<Vector2i, PathfindingChunk> Graph = new();
+}