Add Theme awareness support

[TimLariviere]

(VStack(spacing = 15.) {
    Label("Default label")

    Label("This text will always be green").textColor(Colors.Green)

    Label(ThemeAware.With("Current theme is Light", "Current theme is Dark"))
        .textColor(ThemeAware.With(Colors.Blue, Colors.Red))
        .font(size = ThemeAware.With(12., 20.))

    Image(ThemeAware.With("dotnet_bot.png", "fabulous.png")).size(200., 200.)
})
    .padding(20.)
    .background(ThemeAware.With(Colors.LightBlue, Colors.DarkBlue))

let program =
    Program.stateful init update view
    |> Program.withThemeAwareness

Simulator.Screen.Recording.-.iPhone.14.-.2023-02-09.at.09.43.00.mp4