Aliased the `:enqueue` method and fix the re-enqueueing of the `Consumer`

You are the man.

(FYI https://github.com/rails/rails/blob/e595d91ac2c07371b441f8b04781e7c03ac44135/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb#L639-L656)