sign in with custom auth implmentation file

Author: Umair-Manzoor-47

modules/auth/lib/signin/sign_in_with_custom_auth.dart

@@ -0,0 +1,26 @@
+import 'package:ensemble/framework/action.dart';
+import 'package:ensemble/framework/event.dart';
+import 'package:ensemble/framework/stub/auth_context_manager.dart';
+import 'package:ensemble/screen_controller.dart';
+import 'package:ensemble/widget/stub_widgets.dart';
+import 'package:ensemble_auth/signin/auth_manager.dart';
+import 'package:flutter/material.dart';
+
+class SignInWithCustomAuthImpl implements SignInWithCustomAuth {
+  @override
+  Future<void> signInWithCustomAuth(BuildContext context,
+      {required SignInWithCustomAuthAction action}) async {
+    final isAuthenticated = await AuthManager().signInWithCustomAuth(context,idToken: action.idToken!);
+    if (isAuthenticated != null) {
+      if (action.onAuthenticated != null) {
+        AuthenticatedUser? currentUser = AuthManager().getCurrentUser();
+        ScreenController().executeAction(context, action.onAuthenticated!,
+            event: EnsembleEvent(null, data: {'user': currentUser}));
+      }
+    } else {
+      if (action.onError != null) {
+        ScreenController().executeAction(context, action.onError!);
+      }
+    }
+  }
+}