Add rake task to help debugging HL7 messages
user
```ruby
require "benchmark"

namespace :pathology do
  namespace :test do
    desc "In development only, import a test HL7 message. Useful for testing listeners."
    task import_one: :environment do
      raise NotImplementedError unless Rails.env.development?

      # Load the example HL7 file.
      path = Renalware::Engine.root.join("app", "jobs", "hl7_message_example.yml")
      raw_message = File.read(path)

      # It has a struct header at the top so it can also be dumped into
      # the delayed_job queue, but we want to skip queuing so strip out that header and simulate
      # the message being passed directly to the FeedJob which will persist and process the message.
      raw_message = raw_message.gsub("--- !ruby/struct:FeedJob\n", "")

      # Replace the MSH date with now() to guarantee a unique message. not doing so results in
      # an index violation becuase we calc am MD5 hash of the message and this has to be unique -
      # this prevents us importing the same message twice.
      raw_message = raw_message.gsub("20091112164645", Time.zone.now.strftime("%Y%m%d%H%M%S"))

      # Load the message into a hash as delayed_Job would do and spalt the hash keys as keyword args
      # into the FeedJob ctor.
      hash = YAML.safe_load(*raw_message).symbolize_keys
      FeedJob.new(*hash).perform
    end
  end
end
```
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