Add Sorting Capability for finished_at and failed_at Fields

[hatsu38]

Feature Request: Sorting by finished_at and failed_at fields

It would be very useful if the mission_control-jobs gem could support sorting jobs not only by their jobed times but also by other relevant timestamps such as finished_at and failed_at.

Example Use Cases:

This would be particularly handy when you want to view jobs that have recently failed.

[film42]

To be honest, I was a little confused when I opened the failed queue and found it sorted oldest to newest. I would prefer the failed queue to follow the finish queue, showing newest jobs first.

Here's my expereince:

I was expecting an email to be delivered but it didn't happen. I checked the finished queue and found no matching jobs around the time it should have finished. I checked the failed queue and saw "21 days ago" and thought, "maybe solidqueue dropped it?" Only then did I see they were ordered oldest to newest, and I had to click 5-6 pages in to see the most recent failed job.