Add the scheduler component

[alamirault]

https://github.com/symfony/symfony-docs/actions/runs/7575621828/job/20632633360?pr=19440

Run ../_checker/code-block-checker.php verify:docs `pwd` scheduler.rst  --baseline=baseline.json --output-format=github --symfony-application=`realpath ../_sf_app`

Error: [Missing class] Class, interface or trait with name "Symfony\Component\Scheduler\Attribute\AsSchedule" does not exist
Error: [Missing class] Class, interface or trait with name "Symfony\Component\Scheduler\Schedule" does not exist
Error: [Missing class] Class, interface or trait with name "Symfony\Component\Scheduler\ScheduleProviderInterface" does not exist
Error: Process completed with exit code 1.

[OskarStark]

Thanks