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(),

packages/auth/amplify_auth_cognito_dart/lib/src/sdk/sdk_bridge.dart

@@ -190,6 +190,9 @@ class WrappedCognitoIdentityProviderClient
          ],
        ),
        _dependencyManager = dependencyManager {
+    safePrint('🌐 [SDK Bridge] WrappedCognitoIdentityProviderClient constructor called');
+    safePrint('🌐 [SDK Bridge] region: $region, endpoint parameter: $endpoint');
+    
     // Log the actual baseUri being used
     final baseUri = endpoint == null
         ? null

packages/auth/amplify_auth_cognito_dart/lib/src/state/machines/configuration_state_machine.dart

@@ -67,10 +67,15 @@ final class ConfigurationStateMachine
 
   /// State machine callback for the [Configure] event.
   Future<void> onConfigure(Configure event) async {
+    safePrint('🔧 [Configuration State Machine] onConfigure called');
+    
     final authOutputs = event.config.auth;
     if (authOutputs == null) {
       throw ConfigurationError('No Cognito plugin config available');
     }
+    
+    safePrint('🔧 [Configuration State Machine] AuthOutputs found - userPoolEndpoint: ${authOutputs.userPoolEndpoint}');
+    
     addInstance(authOutputs);
     final waiters = <Future<void>>[];
 
@@ -85,6 +90,8 @@ final class ConfigurationStateMachine
       );
     }
 
+    safePrint('🔧 [Configuration State Machine] Creating WrappedCognitoIdentityProviderClient with endpoint: ${authOutputs.userPoolEndpoint}');
+    
     addInstance<CognitoIdentityProviderClient>(
       WrappedCognitoIdentityProviderClient(
         region: authOutputs.awsRegion,