New package structure for the version 2 of the public api.

Start building up the validators required for post notificaiton.
The app/v2/errors.py is a rough sketch, will be passed a code, the error can look up the message and link for the error message.

app/v2/notifications/post_notifications.py

@@ -0,0 +1,49 @@
+from app.v2.notifications import notification_blueprint
+
+
+@notification_blueprint.route('/sms', methods=['POST'])
+def post_sms_notification():
+    # # get service
+    # service = services_dao.dao_fetch_service_by_id(api_user.service_id)
+    # # validate input against json schema (not marshmallow)
+    # form = validate(request.get_json(), post_sms_request)
+    #
+    # # following checks will be in a common function for all versions of the endpoint.
+    # # check service has not exceeded the sending limit
+    # check_service_message_limit(api_user.key_type, service)
+    # template = templates_dao.dao_get_template_by_id_and_service_id(
+    #     template_id=form['template_id'],
+    #     service_id=service.id
+    # )
+    # # check template is for sms
+    # check_template_is_for_notification_type(SMS_TYPE, template.template_type)
+    # # check template is not archived
+    # check_template_is_active(template)
+    # # check service is allowed to send
+    # service_can_send_to_recipient(form['phone_number'], api_user.key_type, service)
+    # # create body of message (create_template_object_for_notification)
+    # create_template_object_for_notification(template, form.get('personalisation', {}))
+    # # persist notification
+    # # send sms to provider queue for research mode queue
+    #
+
+    # validate post form against post_sms_request schema
+    # validate service
+    # validate template
+    # create content
+    # persist notification
+    # send notification to queue
+    # return post_sms_response schema
+    return "post_sms_response schema", 201
+
+
+@notification_blueprint.route('/email', methods=['POST'])
+def post_email_notification():
+    # validate post form against post_email_request schema
+    # validate service
+    # validate template
+    # persist notification
+    # send notification to queue
+    # create content
+    # return post_email_response schema
+    pass