Implement PrivateAgent

[futursolo]

Description

• Threaded is renamed into PublicAgent
• Added PrivateAgent
  (It's not possible to have 2 impl<AGN> Threaded for AGN with a different Reach).

Fixes #1122

Checklist

• I have run cargo make pr-flow
• I have reviewed my own code
• [NA] I have added tests

[github-actions]

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[ranile]

Can you add docs about what a "private" agent is and what's the difference between "public" and "private" agent?

[futursolo]

Can you add docs about what a "private" agent is and what's the difference between "public" and "private" agent?

The doc about private agent is already in master.

https://yew.rs/docs/next/concepts/agents

[voidpumpkin]

@futursolo In the docs we have

(TODO verify) When the task is done, the agent will disappear.

Could you confirm and edit this or you think is is out of scope for this PR?

[futursolo]

@futursolo In the docs we have

(TODO verify) When the task is done, the agent will disappear.

Could you confirm and edit this or you think is is out of scope for this PR?

This is an old line from the docs of removed job agents. I have updated the docs.

[ranile]

LGTM

Although I will admit, I'm not too familiar with agents code