Double generic types and members with non-generic equivalents #2757

// In addition to these:
T? ParseResult.GetValue<T>(Option<T> option);
new Option<T>(string name, params string[] aliases);
// etc...

// Make it possible to call them like this:
object? ParseResult.GetValue(Option option, Type valueType);
new Option(Type valueType, string name, params string[] aliases);

// We can add service like this:
services.AddSignleton<T>();

// Or this:
services.AddSingleton(Type serviceType);

app.MapCommand("foo", ([Option] FileInfo file) =>
{
    foreach (string line in File.ReadLines(file.FullName))
        Console.WriteLine(line);
});

public void MapCommand(string name, Delegate command)
{
	RootCommand rootCommand = [];
	ParameterInfo[] parameters = command.Method.GetParameters();

	foreach (ParameterInfo parameterInfo in parameters)
	{
		if (parameterInfo.GetCustomAttribute<OptionAttribute>() is not null)
		{
			Option option = (typeof(Option<>).MakeGenericType(parameterInfo.ParameterType).GetConstructor([typeof(string), typeof(string[])])!.Invoke([name]) as Option)!;
			rootCommand.Options.Add(option);
		}
	}
	// etc...
}