[Feature Request] Proactive Messaging sample that uses dialogs

[stevengum]

The current proactive messaging sample (#16 for Node.js) doesn't use dialogs. Resuming or beginning a dialog during a proactive message is a scenario worth investigating. Additionally, the management of Dialogs/DialogSets is worth demonstrating.

Describe the solution you'd like A new proactive messaging sample, or sample 16 to be updated with a path for proactively resuming or beginning a dialog.

Additional context A few customers have run into difficulties managing their Dialogs, and in one case created multiple DialogSets with a shared dialog.

[enhancement]