Motivation:
  - Currently we have 2 seperate monkey patches in place for tracking
  enqueded time for 2 seperate workers. It seems that activejob could be
  a source of truth for how long an item has been enqued so that we can
  easily use it for consistent monitoring across workers/apps to ensure
  that jobs are running at an acceptable speed.

Changes:
  - Add an enqueded at attribute and serilization tooling.
  - Add a method to get how long a job has been enqueded for.
  - Add a logging item to show how long a job was enqued prior to the
  perform method firing.