List account notifications

Returns Meta-originated events recorded for a WhatsApp account, newest first: template review outcomes (approved, rejected, paused, category changes) and WABA status changes (restricted, disabled, reinstated, disconnected). Events are captured from Meta webhooks as they happen; the feed starts at the account's first recorded event and is not backfilled. Complements the push events whatsapp.template.status_updated and account.disconnected with a pollable history.