Added option to sort unread chats to top

lib/storage/base/settingsProvider.dart

@@ -58,6 +58,7 @@ class SettingsProvider extends ChangeNotifier {
       ),
       talkSettings: TalkSettings(
         sortFavoritesToTop: true,
+        sortUnreadToTop: false,
       ),
     );
   }

lib/storage/talk/talkSettings.dart

@@ -5,8 +5,9 @@ part 'talkSettings.g.dart';
 @JsonSerializable()
 class TalkSettings {
   bool sortFavoritesToTop;
+  bool sortUnreadToTop;
 
-  TalkSettings({required this.sortFavoritesToTop});
+  TalkSettings({required this.sortFavoritesToTop, required this.sortUnreadToTop});
 
   factory TalkSettings.fromJson(Map<String, dynamic> json) => _$TalkSettingsFromJson(json);
   Map<String, dynamic> toJson() => _$TalkSettingsToJson(this);

lib/storage/talk/talkSettings.g.dart

@@ -8,9 +8,11 @@ part of 'talkSettings.dart';
 
 TalkSettings _$TalkSettingsFromJson(Map<String, dynamic> json) => TalkSettings(
       sortFavoritesToTop: json['sortFavoritesToTop'] as bool,
+      sortUnreadToTop: json['sortUnreadToTop'] as bool,
     );
 
 Map<String, dynamic> _$TalkSettingsToJson(TalkSettings instance) =>
     <String, dynamic>{
       'sortFavoritesToTop': instance.sortFavoritesToTop,
+      'sortUnreadToTop': instance.sortUnreadToTop,
     };