Is your feature request related to a problem? Please describe:
We would like to to send alert messages to whatsapp and or telegram . For instance use smooch api with a python script that receives the message and its values via arguments from goalert.
Currently we are locked on twilio which cannot configured to use whatsapp instead of SMS.

Describe the solution you'd like:
Having a media type alert or custom script that can be configured with arguments would open to use any message providers.