Connect the incoming call to a number specified in the self-destruct command for added sneakiness

[HouzuoGuo]

Create a new self destruct command that executes the following:

1. Connect the incoming caller to a number specified in the input self-destruct command.
2. Execute self-destruct command in the meanwhile.
3. The outgoing call is sustained by Twilio infrastructure, the server peacefully RIPs as the final call is made.

Thanks to our lovely colleague Riku for the idea!