fix: ensure decoding of UserPublic.identifier is optional [#256] (#257)

Author: slightfoot

packages/clerk_auth/lib/src/models/client/user_public.dart

@@ -19,7 +19,7 @@ class UserPublic with InformativeToStringMixin {
   });
 
   /// identifier
-  final String identifier;
+  final String? identifier;
 
   /// first name
   final String? firstName;

packages/clerk_auth/lib/src/models/client/user_public.g.dart

@@ -67,7 +67,7 @@ void main() {
         expect(client?.signIn, null);
         expect(client?.activeSession?.status, Status.active);
         expect(
-            client?.activeSession?.publicUserData.identifier.isNotEmpty, true);
+            client?.activeSession?.publicUserData.identifier?.isNotEmpty, true);
       });
     });
 
@@ -114,7 +114,7 @@ void main() {
         expect(client?.signIn, null);
         expect(client?.activeSession?.status, Status.active);
         expect(
-            client?.activeSession?.publicUserData.identifier.isNotEmpty, true);
+            client?.activeSession?.publicUserData.identifier?.isNotEmpty, true);
       });
     });
 
@@ -198,7 +198,7 @@ void main() {
         expect(client?.signIn, null);
         expect(client?.activeSession?.status, Status.active);
         expect(
-            client?.activeSession?.publicUserData.identifier.isNotEmpty, true);
+            client?.activeSession?.publicUserData.identifier?.isNotEmpty, true);
       });
     });
   });

packages/clerk_auth/test/integration/clerk_api/sign_in_test.dart

@@ -97,7 +97,7 @@ void main() {
         expect(client?.signUp, null);
         expect(client?.activeSession?.status, Status.active);
         expect(
-            client?.activeSession?.publicUserData.identifier.isNotEmpty, true);
+            client?.activeSession?.publicUserData.identifier?.isNotEmpty, true);
       });
     });
 
@@ -144,7 +144,7 @@ void main() {
         expect(client?.signUp, null);
         expect(client?.activeSession?.status, Status.active);
         expect(
-            client?.activeSession?.publicUserData.identifier.isNotEmpty, true);
+            client?.activeSession?.publicUserData.identifier?.isNotEmpty, true);
       });
     });
   });