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.

lib/platform/app_platform_stub.dart

@@ -0,0 +1,11 @@
+bool get isAndroid => false;
+
+bool get isIOS => false;
+
+bool get isLinux => false;
+
+bool get isMacOS => false;
+
+bool get isWindows => false;
+
+bool get isDesktop => false;