- Updated README.md to reflect platform support for iPadOS.
- Implemented isDriverAvailable method in FlutterUsbSerialPlugin for DriverKit readiness check.
- Added DriverKitSerialClient C source and header files for iPadOS integration.
- Created Swift Package for iPadOS support.
- Updated pubspec.yaml and flutter_usb_serial.dart to clarify platform compatibility.
- Enhanced tests to verify isDriverAvailable functionality.
Signed-off-by: Tony <tonylu@tony-cloud.com>