Converted all the devices models to extends from DeviceModel for the purpose of unifying.

Initialized Lights feature.

lib/features/devices/model/device_model.dart

@@ -0,0 +1,20 @@
+abstract class DeviceModel {
+  final String? id;
+  final String? name;
+  final String? type;
+  bool? status;
+  final String? location;
+  final String? image;
+  final double? timer;
+  bool isSelected = false;
+
+  DeviceModel({
+    required this.id,
+    required this.name,
+    required this.type,
+    required this.status,
+    required this.location,
+    required this.image,
+    required this.timer,
+  });
+}