[12.x] Add midday() method to scheduler

[amirhshokri]

This PR introduces a new midday() method to Laravel’s scheduler, allowing developers to schedule tasks to run daily at 12:00 PM using a more readable syntax:

Schedule::command('foo')->midday();

Schedule::command('foo')
    ->weekdays()
    ->midday()
    ->timezone('America/Chicago') 

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!