feature request: initiate and automate verification

I would like to use matrix-commander-rs for secure contact with users of my service. To do this, I need to be able to do verification with them from my service with uses matrix-commander-rs in an automated fashion.

The workflow I would like to achieve is that the users put their matrix handle in a form on the website and upon confirmation are contacted, then verified by displaying the emojis on the website which they can confirm.

To achieve this I would need the following:
* Ability for matrix-commander-rs to initiate verification
* Output of emojis for verification in JSON format
* Ability to confirm emojis ideally by sending a JSON message