Cron jobs and events

[jeroenrinzema]

Flows should be able to be triggered by events and cron jobs. Events and cron jobs should be modules passed to Semaphore. This allows for multiple modules being developed and the ability to develop specific modules for specific environments.
Below is some proposed syntax. The final syntax is not decided yet.

event "SendEmail" "nats" "orders" {
  // additional options could be passed over here
}

cron "SendEmail" "0 * * * *" {
  // additional options could be passed over here
}