TF-2764 Add CancelToken to download attachment for web

lib/features/email/data/datasource_impl/email_datasource_impl.dart

@@ -134,7 +134,8 @@ class EmailDataSourceImpl extends EmailDataSource {
       AccountId accountId,
       String baseDownloadUrl,
       AccountRequest accountRequest,
-      StreamController<Either<Failure, Success>> onReceiveController
+      StreamController<Either<Failure, Success>> onReceiveController,
+      {CancelToken? cancelToken}
   ) {
     return Future.sync(() async {
       return await emailAPI.downloadAttachmentForWeb(
@@ -143,7 +144,8 @@ class EmailDataSourceImpl extends EmailDataSource {
           accountId,
           baseDownloadUrl,
           accountRequest,
-          onReceiveController);
+          onReceiveController,
+          cancelToken: cancelToken);
     }).catchError(_exceptionThrower.throwException);
   }
 

lib/features/email/data/datasource_impl/email_hive_cache_datasource_impl.dart

@@ -81,7 +81,15 @@ class EmailHiveCacheDataSourceImpl extends EmailDataSource {
   }
 
   @override
-  Future<Uint8List> downloadAttachmentForWeb(DownloadTaskId taskId, Attachment attachment, AccountId accountId, String baseDownloadUrl, AccountRequest accountRequest, StreamController<Either<Failure, Success>> onReceiveController) {
+  Future<Uint8List> downloadAttachmentForWeb(
+    DownloadTaskId taskId,
+    Attachment attachment,
+    AccountId accountId,
+    String baseDownloadUrl,
+    AccountRequest accountRequest,
+    StreamController<Either<Failure, Success>> onReceiveController,
+    {CancelToken? cancelToken}
+  ) {
     throw UnimplementedError();
   }