Add config option to set a custom queue

[AlexanderFalkenberg]

An option for setting a custom queue in the Statamic configs. For example for static caching, which is using the default queue by default. Would be very helpful for larger applications, which are dependent on queue management while easy to implement.

[ryanmitchell]

There is an open PR for specifying the queue connection for the warm command: https://github.com/statamic/cms/pull/8634