public IActionResult Index()
        {
            var output = @$ "First usage (in the controller): 
                Transient service result: {transientNumberService.Number}
                Scoped service result: {scopedNumberService.Number}
                Singleton service result: {singletonNumberService.Number}

            Second usage (in the consumer service):
                Transient service result: {consumerService.GetNumberFromTransientService()}
                Scoped service result: {consumerService.GetNumberFromScopedService()}
                Singleton service result: {consumerService.GetNumberFromSingletonService()}";

            return(Content(output));
        }