New table and endpoints for service contact lists.

- Table to store meta data for the emergency contact list for a service.
- Endpoint for fetching contact lists for service
- Endpoint for saving contact list for service.

The list will be stored in S3. The service will then be able to send emergency announcements to staff.

app/dao/service_contact_list_dao.py

@@ -0,0 +1,16 @@
+from app import db
+from app.models import ServiceContactList
+
+
+def dao_get_contact_lists(service_id):
+    contact_lists = ServiceContactList.query.filter_by(
+        service_id=service_id
+    ).order_by(
+        ServiceContactList.created_at.desc()
+    )
+    return contact_lists.all()
+
+
+def save_service_contact_list(service_contact_list):
+    db.session.add(service_contact_list)
+    db.session.commit()