feat(auth): add logging for plugin configuration and sign-in

Author: nathan-dovire

packages/amplify_core/lib/src/amplify_class.dart

@@ -180,6 +180,9 @@ abstract class AmplifyClass {
 
   /// Configures all plugins in topologically-sorted order.
   Future<void> _configurePlugins(AmplifyOutputs config) async {
+    safePrint(
+      '⚙️ [Amplify Core] Configuring plugins with AuthOutputs.userPoolEndpoint: ${config.auth?.userPoolEndpoint}',
+    );
     await Future.wait(_addPluginFutures);
     _addPluginFutures.clear();
     final categories = <Category, AmplifyCategory>{

packages/auth/amplify_auth_cognito_dart/lib/src/auth_plugin_impl.dart

@@ -515,6 +515,10 @@ class AmplifyAuthCognitoDart extends AuthPluginInterface
     String? password,
     SignInOptions? options,
   }) async {
+    safePrint(
+      '🔐 [Auth Plugin] signIn called with username: $username (password provided: ${password != null})',
+    );
+    
     final pluginOptions = reifyPluginOptions(
       pluginOptions: options?.pluginOptions,
       defaultPluginOptions: const CognitoSignInPluginOptions(),