TF-4128 Separate download handling into independent class to decouple from views on web

lib/features/email/data/repository/email_repository_impl.dart

@@ -1,13 +1,9 @@
 import 'dart:async';
-import 'dart:typed_data';
 
 import 'package:core/data/model/source_type/data_source_type.dart';
 import 'package:core/data/network/download/downloaded_response.dart';
-import 'package:core/presentation/state/failure.dart';
-import 'package:core/presentation/state/success.dart';
 import 'package:core/presentation/utils/html_transformer/transform_configuration.dart';
 import 'package:core/utils/app_logger.dart';
-import 'package:dartz/dartz.dart';
 import 'package:dio/dio.dart';
 import 'package:email_recovery/email_recovery/email_recovery_action.dart';
 import 'package:email_recovery/email_recovery/email_recovery_action_id.dart';
@@ -19,7 +15,6 @@ import 'package:jmap_dart_client/jmap/core/session/session.dart';
 import 'package:jmap_dart_client/jmap/core/state.dart' as jmap;
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:model/account/account_request.dart';
-import 'package:model/download/download_task_id.dart';
 import 'package:model/email/attachment.dart';
 import 'package:model/email/email_content.dart';
 import 'package:model/email/mark_star_action.dart';
@@ -142,16 +137,6 @@ class EmailRepositoryImpl extends EmailRepository {
     return result;
   }
 
-  @override
-  Future<List<DownloadTaskId>> downloadAttachments(
-      List<Attachment> attachments,
-      AccountId accountId,
-      String baseDownloadUrl,
-      AccountRequest accountRequest
-  ) {
-    return emailDataSource[DataSourceType.network]!.downloadAttachments(attachments, accountId, baseDownloadUrl, accountRequest);
-  }
-
   @override
   Future<DownloadedResponse> exportAttachment(
       Attachment attachment,
@@ -395,26 +380,6 @@ class EmailRepositoryImpl extends EmailRepository {
     return result;
   }
 
-  @override
-  Future<Uint8List> downloadAttachmentForWeb(
-      DownloadTaskId taskId,
-      Attachment attachment,
-      AccountId accountId,
-      String baseDownloadUrl,
-      AccountRequest accountRequest,
-      StreamController<Either<Failure, Success>> onReceiveController,
-      {CancelToken? cancelToken}
-  ) {
-    return emailDataSource[DataSourceType.network]!.downloadAttachmentForWeb(
-        taskId,
-        attachment,
-        accountId,
-        baseDownloadUrl,
-        accountRequest,
-        onReceiveController,
-        cancelToken: cancelToken);
-  }
-
   @override
   Future<({
     List<EmailId> emailIdsSuccess,
@@ -575,28 +540,7 @@ class EmailRepositoryImpl extends EmailRepository {
       htmlContent,
       configuration);
   }
-  
-  @override
-  Future<void> downloadAllAttachmentsForWeb(
-    AccountId accountId,
-    EmailId emailId,
-    String baseDownloadAllUrl,
-    String outputFileName,
-    AccountRequest accountRequest, 
-    DownloadTaskId taskId,
-    StreamController<Either<Failure, Success>> onReceiveController,
-    {CancelToken? cancelToken}
-  ) => emailDataSource[DataSourceType.network]!.downloadAllAttachmentsForWeb(
-    accountId,
-    emailId,
-    baseDownloadAllUrl,
-    outputFileName,
-    accountRequest,
-    taskId,
-    onReceiveController,
-    cancelToken: cancelToken,
-  );
-  
+
   @override
   Future<DownloadedResponse> exportAllAttachments(
     AccountId accountId,