Power Rework (#863)

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Server/GameObjects/Components/NodeContainer/NodeGroups/NodeGroupAttribute.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Content.Server.GameObjects.Components.NodeContainer.NodeGroups
+{
+    /// <summary>
+    ///     Associates a <see cref="INodeGroup"/> implementation with a <see cref="NodeGroupID"/>.
+    ///     This is used to gurantee all <see cref="INode"/>s of the same <see cref="INode.NodeGroupID"/>
+    ///     have the same type of <see cref="INodeGroup"/>. Used by <see cref="INodeGroupFactory"/>.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    public class NodeGroupAttribute : Attribute
+    {
+        public NodeGroupID[] NodeGroupIDs { get; }
+
+        public NodeGroupAttribute(params NodeGroupID[] nodeGroupTypes)
+        {
+            NodeGroupIDs = nodeGroupTypes;
+        }
+    }
+}