Idea: Make DragonFruit attribute-based, not (or not only) xml-based

[Romfos]

Would be nice to have DragonFruit with attributes-based, not xml-based approach

[CommandLineApp("Tool description")]
public static void Main(
    [CommandLineOption("this is value")] int value = 1,
    [CommandLineOption("this is value2")] int value2 = 1)
{
}

potentially it should make possible to make compatible with dotnet/csharplang#5045