Changes to createNotification

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 413

added the new optional request property allOf[subschema #2]/skip_user_resolution

added the new optional request property allOf[subschema #2]/template_id

added the new optional request property allOf[#/components/schemas/NotificationBase]/allowed_channels