[12.x] Allow Scheduled Command Event macros to be applied to schedule groups

[stevebauman]

This PR allows Event macros registered by third-party packages (such as Sentry, Oh Dear, etc.) to be applied to schedule groups.

Currently, built-in attributes like onOneServer() and runInBackground() work on groups, but package-level macros must be applied to each command individually:

https://docs.sentry.io/platforms/php/guides/laravel/crons/#job-monitoring

https://github.com/getsentry/sentry-laravel/blob/dbaeb9a469a92414b5d3d294c7c971a47bcab9a3/src/Sentry/Laravel/Features/ConsoleSchedulingIntegration.php#L69

$schedule
    ->onOneServer()
    ->group(function (Schedule $schedule) {
        $schedule->command('foo')->sentryMonitor();
        $schedule->command('bar')->sentryMonitor();
        $schedule->command('baz')->sentryMonitor();
    });

With this change, macros registered on Illuminate\Console\Scheduling\Event are automatically recorded and replayed onto each event in the group:

$schedule
    ->onOneServer()
    ->sentryMonitor()
    ->group(function (Schedule $schedule) {
        $schedule->command('foo');
        $schedule->command('bar');
        $schedule->command('baz');
    });