support Fluent UI System Icons from Microsoft

[ekuleshov]

Describe the use-cases of your feature

With raise of desktop platforms and especially Windows it would be really nice to have support for icon previews for the fluentui_system_icons package from Microsoft. See https://pub.dev/packages/fluentui_system_icons

Describe your solution

With support added we would see these icon previews when developing for Windows desktop, similar to existing material, cupertino and mdi icons.