Add cron_enabled attribute to good_job and pass it to process current state

[saksham-jain]

• Add cron_enabled attribute to good_job.
• Set this attribute on initialization using enable_cron key in configuration.
• Add new key cron_enabled to process current_state and use GoodJob.cron_enabled to set this key.

[bensheldon]

@saksham-jain could you please fix up the lint warning? This looks good 👍🏻

[bensheldon]

👍🏻 thank you!

[bensheldon]

@saksham-jain Thank you for the PR. I really appreciate this! Are you interested in further issues?

Just having worked through with this, I see a few jumping off points for improvement:

• Rename that configuration option to be Configuration#cron_enabled? so it's consistent and the less awkward construction.
• Could you go through Configuration and propose other configuration options you think would be meaningful to expose on the process state for debugging in the dashboard?

[saksham-jain]

Thanks, @bensheldon. I will check these points.