Scene picker: Added option to add groups of scenes to open

Editor/Toolbar/Tools/ScenePickerObjects/SceneGroupArray.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+
+namespace Module.NavigationTool.Editor.Toolbar
+{
+    [Serializable]
+    public sealed class SceneGroupArray
+    {
+        public List<SceneGroup> groups = new();
+        
+        public int Count => groups.Count;
+        public SceneGroup this[int index] => groups[index];
+    }
+}