Support ruby 3 and kwargs

[jdelStrother]

Based on the work @webhoernchen started in #1130.

We've been running this in production for a month while upgrading an installation from ruby 2.7 to 3.0 without issue. I think I've managed to keep support for ruby 2.6, but haven't done much more than run the test suite on it.

[unixmonkey]

@jdelStrother Could you fix the conflicts in this PR to make it mergable? This is working great for me on a Ruby 3.1 project, and I'd love to see it get released.

[jdelStrother]

If the maintainers are interested in merging this I’ll fix up the conflicts, but I’m no longer using DJ. Feel free to take over this branch if you’re more invested

[c960657]

You should also pass add **kwargs to the method generated dynamically by handle_asynchronously:

delayed_job/lib/delayed/message_sending.rb

Lines 39 to 50 in b66bb64

	define_method(with_method) do |*args|
	curr_opts = opts.clone
	curr_opts.each_key do |key|
	next unless (val = curr_opts[key]).is_a?(Proc)
	curr_opts[key] = if val.arity == 1
	val.call(self)
	else
	val.call
	end
	end
	delay(curr_opts).__send__(without_method, *args)
	end