Provide a better way to hook custom help

[blowdart]

Having to define internal sealed class CustomHelpAction(HelpAction action) : SynchronousCommandLineAction and then loop through Options on the rootCommand looking for is HelpOption is a lot of ceremony.

Could we have something like

var rootCommand = new RootCommand("RootCommand")
{
  myArgument,
  myOption1,
  myOption2,
  HelpAction => () { Console.Writeline("Easy help!") }
};

or

rootCommand.SetHelp((cancellationToken) =>
{
   Console.Writeline("Easy help!")
}