Provide an icon config when compile exe

[liudonghua123]

Thank you for taking the time to file an issue!

• Dart SDK Version (dart --version) Dart SDK version: 2.12.1 (stable) (Wed Mar 10 10:18:47 2021 +0100) on "windows_x64"
• Whether you are using Windows, MacOSX, or Linux (if applicable) Windows
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I want to add an icon to a dart console app, but I tried using rcedit, resourcehacker, none of them works, see electron/rcedit#91 (comment) for more details. Maybe the exe compiled from dart is not an ordinary exe like msvc, rust build, I tried to add icon to exe build from rust, it is ok.

I hope the dart compile could support this feature built-in.

[liudonghua123]

It seems fixed in 2.17.0-246.0.dev. see related signing issue #39106.