Expire a conversation in a Power Virtual Agent

[Expiscornovus]

It would be great to be able to:

- Set a ExpireAfterSeconds setting for conversations of a Power Virtual Agent

- When the user doesn't respond redirect to a time-out system topic or even better your own custom topic. In that topic you should be able to show a custom message like: sorry, do you still need help. You haven't responded in a while.

Based on this thread: https://powerusers.microsoft.com/t5/General/Automate-a-message-when-the-user-has-not-responded-to-th...

Also inspired by the bot framework:

https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-howto-expire-conversation?view=azure-...