Support WinHTTP-based HTTP client for Windows (similar to cupertino_http and cronet_http)

[UnluckyY1]

Hi Dart team 👋

I’d like to ask if there are any plans to provide a WinHTTP-based implementation for the http package on Windows, similar to how: • cronet_http is used on Android • cupertino_http is used on iOS/macOS

Currently, there’s no native Windows equivalent. As a result, apps using Dart/Flutter on Windows rely solely on the default Dart HTTP stack, which may not take advantage of Windows’ native networking capabilities (e.g. WinHTTP, proxy integration, certificate management, etc.).

This would also help resolve long-standing issues such as: flutter/flutter#26359