response: support auto-chunking for HTTP/1.1

We might as well do it since puma and thin both do(*),
and we can still do writev for now to get some speedups
by avoiding Rack::Chunked overhead.

timing runs of "curl --no-buffer http://127.0.0.1:9292/ >/dev/null"
results in a best case drop from ~260ms to ~205ms on one VM
by disabling Rack::Chunked in the below config.ru

$ ruby -I lib bin/yahns-rackup -E none config.ru

==> config.ru <==
class Body
  STR = ' ' * 1024 * 16
  def each
    10000.times { yield STR }
  end
end

use Rack::Chunked if ENV['RACK_CHUNKED']
run(lambda do |env|
  [ 200, [ %w(Content-Type text/plain) ], Body.new ]
end)

(*) they can do Content-Length, but I don't think it's
    worth the effort at the server level.

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