Private agents don't implement Threaded

[jstarry]

Problem

Lacking the following implementation:

impl<T> Threaded for T
where
    T: Agent<Reach = Private>,

Implementation Tips

• Implementing Threaded is a good first step.
• Handler id's aren't relevant here (same as Job) and so we have the SINGLETON_ID for this reason.
  *The message queue is pretty important as well and tracked here: Implement a message queue for private workers #937

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[mkawalec]

claiming this as well, as it's going to be an integral part of #947

[ranile]

Is this relevant after #2295?

CC: @futursolo

[futursolo]

Is this relevant after #2295?

CC: @futursolo

I think so. I can take a took of this after #2295 is settled.