Separation of SMS authorization in backend to run on local server

Separate out the SMS authorization from the core cloud service into a separate service. The goal here is to take the functionality where PII is involved and separate it from the rest of the cloud infrastructure. This lets the SMS functionality to be hosted on a non cloud service.

Start by mapping where SMS authorization and PII-related functionality currently live in the backend and core cloud service. Define the boundary and hosting requirements for a separate non-cloud service; done means the SMS functionality can run independently without moving the rest of the cloud infrastructure.

Written by the indexing model from the issue text.