[FEATURE] Get user input as additional rewiever

[RicardoNiepel]

Is your feature request related to a problem? Please describe.
No user involvement in the article reviewing process.

Describe the solution you'd like
It should be possible for the user to provide additional feedback to the Writer Agent after the Editor Agent has no other findings.
If a official UserProxyAgent would be available in Semantic Kernel, it could be added into the GroupChat with the two agents.
Currently that's not available.

Describe alternatives you've considered
A new chat can be established between the Writer Agent and user input, inserting the last article version into the chat history.

Additional context

• .Net Agents: Improve user involvement in group chat microsoft/semantic-kernel#6758
• UserProxyAgent in AutoGen