Add Windows runner files for high DPI support and console output

- Created runner.exe.manifest to enable DPI awareness and dark mode support.
- Implemented utility functions in utils.cpp and utils.h for console creation and command line argument handling.
- Developed Win32Window class in win32_window.cpp and win32_window.h to manage high DPI-aware windows, including theme updates and message handling.

test/widget_test.dart

@@ -0,0 +1,13 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:notas/app.dart';
+
+void main() {
+  testWidgets('Loads the notes app shell', (WidgetTester tester) async {
+    await tester.pumpWidget(const NotesApp());
+
+    expect(find.byType(MaterialApp), findsOneWidget);
+    expect(find.text('Mis Notas'), findsWidgets);
+  });
+}