TF-3082 Restore identity from cache

lib/features/identity_creator/data/datasource/identity_creator_data_source.dart

@@ -7,4 +7,10 @@ abstract class IdentityCreatorDataSource {
     AccountId accountId,
     UserName userName,
     {required IdentityCache identityCache});
+
+  Future<IdentityCache> getIdentityCacheOnWeb(
+    AccountId accountId,
+    UserName userName);
+
+  Future<void> removeIdentityCacheOnWeb();
 }