Add ML job state resource

[tobio]

Requires #1329

This resource is intended to manage the state of an ML anomaly detection job. Specifically, whether the job is opened of closed. The intention here is to ultimately have four resources:

• The anomaly detection job
• The data feed
• The job state (this PR)
• The data feed state

This is intended to better align with the lifecycle of the underlying stack resources, whilst also simplifying the job and data feed resources.