List mailbox events

Returns mailbox audit records, newest first, filterable by when they happened (after, before). Audit event types: mailbox.created, endpoint.attached, endpoint.detached, message.received, message.released, message.sent, thread.created, action.proposed, action.policy_decided, action.approval_requested, action.approval_resolved, action.accepted, action.executed, action.failed. Thread and draft changes have no dedicated audit event types. Pass nextCursor back as cursor for the next page; it is null on the last page.