[Queue] Switch from kue

[rohit-gohri]

Kue is no longer being maintained, https://twitter.com/automattic/status/1019073146446602240

Possible alternatives: https://github.com/OptimalBits/bull

Yes, bull is a good choice. Switching to that would be a good idea.

[rohit-gohri]

kue is deprecated (Automattic/kue#1231). Need to switch soon