XD-364 - Create Trigger Registry

* Create Trigger Controller (REST Endpoint)
* Persist Trigger to Redis
* Create associated domain objects

Originally the ideas was to allow the following REST call using `POST` to `http://localhost:8080/triggers/myAwesomeTrigger`:

`--cron='*/10 * * * * *'` but in order to support the existing Stream parser you need to use: `trigger --cron='*/10 * * * * *'`