TF-2948 Apply new identity view for web

Signed-off-by: dab246 <tdvu@linagora.com>

lib/features/manage_account/domain/model/identity_signature.dart

@@ -0,0 +1,19 @@
+import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/identities/identity.dart';
+
+class IdentitySignature with EquatableMixin {
+  final IdentityId identityId;
+  final String signature;
+
+  IdentitySignature({required this.identityId, required this.signature});
+
+  IdentitySignature newSignature(String newSignature) {
+    return IdentitySignature(
+      identityId: identityId,
+      signature: newSignature
+    );
+  }
+
+  @override
+  List<Object> get props => [identityId, signature];
+}