.Net: Add a function that accepts a chat history (or group chat) object and takes the last N messages

[madsbolaris]

The following handlebars template should be possible...

{{messages (topNMessages chatHistory 20)}}

This would render the top 20 messages in the prompt template

[KSemenenko]

I saw handlebars was deprecated, and also now all of use use native model plugins, I think we need a pass to pass history into plugin. And also system message

[markwallace-microsoft]

This can be done by creating a method and registering with the Kernel