TF-82 Create an email as drafts

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

@@ -34,4 +34,6 @@ abstract class EmailDataSource {
     List<Email> emails,
     MarkStarAction markStarAction
   );
+
+  Future<bool> saveEmailAsDrafts(AccountId accountId, Email email);
 }

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

@@ -86,4 +86,13 @@ class EmailDataSourceImpl extends EmailDataSource {
       throw error;
     });
   }
+
+  @override
+  Future<bool> saveEmailAsDrafts(AccountId accountId, Email email) {
+    return Future.sync(() async {
+      return await emailAPI.saveEmailAsDrafts(accountId, email);
+    }).catchError((error) {
+      throw error;
+    });
+  }
 }

lib/features/email/data/network/email_api.dart

@@ -253,4 +253,28 @@ class EmailAPI {
       throw error;
     });
   }
+
+  Future<bool> saveEmailAsDrafts(AccountId accountId, Email email) async {
+    final setEmailMethod = SetEmailMethod(accountId)
+      ..addCreate(email.id.id, email);
+
+    final requestBuilder = JmapRequestBuilder(_httpClient, ProcessingInvocation());
+
+    final setEmailInvocation = requestBuilder.invocation(setEmailMethod);
+
+    final response = await (requestBuilder
+        ..usings(setEmailMethod.requiredCapabilities))
+      .build()
+      .execute();
+
+    final setEmailResponse = response.parse<SetEmailResponse>(
+        setEmailInvocation.methodCallId,
+        SetEmailResponse.deserialize);
+
+    return Future.sync(() async {
+     return setEmailResponse?.created?[email.id.id] != null;
+    }).catchError((error) {
+      throw error;
+    });
+  }
 }

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

@@ -88,4 +88,9 @@ class EmailRepositoryImpl extends EmailRepository {
       })
       .toList());
   }
+
+  @override
+  Future<bool> saveEmailAsDrafts(AccountId accountId, Email email) {
+    return emailDataSource.saveEmailAsDrafts(accountId, email);
+  }
 }