New cop to suggest using bulk enqueue methods

[fatkodima]

Instead of enqueuing jobs in a loop or sending emails in a loop, it is much more efficient to enqueue them all at once.

# bad
ids.each do |id|
  SomeJob.perform_later(id)
end

# good
jobs = ids.map { |id| SomeJob.new(id) }
ActiveJob.perform_all_later(jobs)

Similar ActionMailer's deliver_all_later. Possibly can also check for sidekiq's perform_bulk.

I see a lot of places in my app where this is violated and recently improved a lot of code paths in terms of performance by using these methods.

I already have this cop implemented, so can contribute if accepted.

[koic]

If the proposal to the Rails style guide is accepted first, it could then be provided as a cop:
https://github.com/rubocop/rails-style-guide