Add necessary repository logic to start sending of new SMS notifications.

[SandGrainOne]

Description

Update Repository logic and PostgreSQL objects to support sending of SMS notifications.

Tasks

• Create a new function called getsms_statusnew_updatestatus. The function should retrieve all new SMS notifications and update them with a status indicating that they are being processed. Status "Sending". Use getemails_statusnew_updatestatus as inspiration.
• Update the SmsNotificationRepository class with a method; GetNewNotifications to retrieve SMS notifications with the new function. Create the Repository class if not already added by another change.
• Write integration tests
  - [ ] Write unit tests
• Review
• Documentation

Acceptance criteria

• Method returns all SMS notifications not already processed for "Sending".
• When the method has returned all SMS notifications are marked as "Sending".

[acn-sbuad]

Will be tested once full workflow is implemented