TF-527 Add data layer in add new identity

lib/features/manage_account/data/network/manage_account_api.dart

@@ -8,6 +8,7 @@ import 'package:jmap_dart_client/jmap/identities/identity.dart';
 import 'package:jmap_dart_client/jmap/identities/set/set_identity_method.dart';
 import 'package:jmap_dart_client/jmap/identities/set/set_identity_response.dart';
 import 'package:jmap_dart_client/jmap/jmap_request.dart';
+import 'package:tmail_ui_user/features/manage_account/domain/model/create_new_identity_request.dart';
 import 'package:tmail_ui_user/features/manage_account/domain/model/identities_response.dart';
 
 class ManageAccountAPI {
@@ -34,6 +35,30 @@ class ManageAccountAPI {
     return IdentitiesResponse(identities: response?.list, state: response?.state);
   }
 
+  Future<Identity> createNewIdentity(AccountId accountId, CreateNewIdentityRequest identityRequest) async {
+    final setIdentityMethod = SetIdentityMethod(accountId)
+      ..addCreate(identityRequest.creationId, identityRequest.newIdentity);
+
+    final requestBuilder = JmapRequestBuilder(_httpClient, ProcessingInvocation());
+
+    final setIdentityInvocation = requestBuilder.invocation(setIdentityMethod);
+
+    final response = await (requestBuilder
+        ..usings(setIdentityMethod.requiredCapabilities))
+      .build()
+      .execute();
+
+    final setIdentityResponse = response.parse<SetIdentityResponse>(
+        setIdentityInvocation.methodCallId,
+        SetIdentityResponse.deserialize);
+
+    return Future.sync(() async {
+      return setIdentityResponse!.created![identityRequest.creationId]!;
+    }).catchError((error) {
+      throw error;
+    });
+  }
+
   Future<bool> deleteIdentity(AccountId accountId, IdentityId identityId) async {
     final setIdentityMethod = SetIdentityMethod(accountId)
       ..addDestroy({identityId.id});