Integrate ActiveJob / DeliverLater / GlobalID with Rails

WIP.
There's no need for `AS::Concern` to just add a writer, you can do it on the module itself:

```ruby
require 'securerandom'

module Identifier
  attr_writer :job_id

  def job_id
    @job_id ||= SecureRandom.uuid
  end
end

class Zomg
  include Identifier
end

z = Zomg.new
puts z.job_id
z.job_id = "lol"
puts z.job_id

=begin
1086b0a6-ba23-4d30-96d5-b3f7523b7fb3
lol
=end
```