Unwrap ActiveJob job class in WebUI

[ibrahima]

Unwraps ActiveJob job classes in the web UI.

This does not unwrap the arguments, but that would be a nice addition as well.

Based on similar logic from Sidekiq, thanks for the pointer @mperham! I barely understand Go so I hope the code is okay.

https://github.com/sidekiq/sidekiq/blob/73c150d0430a8394cadb5cd49218895b113613a0/lib/sidekiq/api.rb#L374-L389

Before:

After:

(This is from the "queue" page, which uses Type for the column, and apparently a darker font.)

Fixes #459

[mperham]

Wow, this is great stuff. Well done, I'm impressed.

[ibrahima]

Thanks!