Add device icons based on device type and update network exception handling

- Add logic to set device icons based on device type in DeviceModel.fromJson method
- Update network exception handling to parse HTML response in ServerFailure class
- Add html package as a dependency for parsing HTML responses
-Added Devices Icons by updateing device types mapping

lib/services/api/network_exception.dart

@@ -1,4 +1,5 @@
 import 'package:dio/dio.dart';
+import 'package:html/parser.dart' as parser;
 
 abstract class Failure {
   final String errMessage;
@@ -28,8 +29,12 @@ class ServerFailure extends Failure {
         return ServerFailure("Bad certificate!");
 
       case DioExceptionType.badResponse:
-        return ServerFailure.fromResponse(dioError.response!.statusCode!,
-            dioError.response!.data!["message"]);
+        {
+          var document = parser.parse(dioError.response!.data.toString());
+          var message = document.body!.text;
+          return ServerFailure.fromResponse(
+              dioError.response!.statusCode!, message);
+        }
       case DioExceptionType.cancel:
         return ServerFailure("The request to ApiServer was canceled");