Create cronitors from the app

[rsyring]

https://github.com/cronitorio/cronitor-python#configuring-monitors

[bchopson]

A few notes:

• If you remove a monitor from your config, it doesn't get deleted on the backend
• Monitors should have a unique key AND a unique name according to Cronitor support, since the API looks up by both. They may fix that issue at some point.
• They recommend one monitor for all environments, but you can't have distinct alert groups per environment for a monitor. Per-environment alert groups are on their roadmap, however.