TF-2667 Show sending message dialog when click send button

lib/features/email/data/datasource/email_datasource.dart

@@ -28,7 +28,7 @@ import 'package:tmail_ui_user/features/sending_queue/domain/model/sending_email.
 abstract class EmailDataSource {
   Future<Email> getEmailContent(Session session, AccountId accountId, EmailId emailId);
 
-  Future<bool> sendEmail(
+  Future<void> sendEmail(
     Session session,
     AccountId accountId,
     EmailRequest emailRequest,

lib/features/email/data/datasource/html_datasource.dart

@@ -1,6 +1,8 @@
-
 import 'package:core/presentation/utils/html_transformer/transform_configuration.dart';
-import 'package:model/model.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_body_part.dart';
+import 'package:model/email/attachment.dart';
+import 'package:model/email/email_content.dart';
 
 abstract class HtmlDataSource {
   Future<EmailContent> transformEmailContent(
@@ -13,4 +15,11 @@ abstract class HtmlDataSource {
     String htmlContent,
     TransformConfiguration configuration
   );
+
+  Future<Tuple2<String, Set<EmailBodyPart>>> replaceImageBase64ToImageCID({
+    required String emailContent,
+    required Map<String, Attachment> inlineAttachments
+  });
+
+  Future<String> removeCollapsedExpandedSignatureEffect({required String emailContent});
 }