Add anomaly detection jobs to calendar API

Adds an anomaly detection job to a calendar.

PUT _ml/calendars/<calendar_id>/jobs/<job_id>

Requires the manage_ml cluster privilege. This privilege is included in the machine_learning_admin built-in role.

<calendar_id>: (Required, string) A string that uniquely identifies a calendar.
<job_id>: (Required, string) An identifier for the anomaly detection jobs. It can be a job identifier, a group name, or a comma-separated list of jobs or groups.

PUT _ml/calendars/planned-outages/jobs/total-requests

The API returns the following results:

{
  "calendar_id": "planned-outages",
  "job_ids": [
    "total-requests"
  ]
}