Command option to run scheduler in a particular timezone

[sausin]

An option to set a separate timezone for scheduler was included in laravel/framework#26794. However, in my case there will be users spread across different timezones and will require functions to run on specific times in their respective timezones.

I was thinking that if the schedule:work command could have a timezone flag, then setting things up for a scenario like above could make things easier.

Happy to get other people's thoughts on this.