fetchLatest(batchHandler, options) {
        const mailgunOptions = {
            limit: PAGE_LIMIT,
            event: options?.events ? options.events.join(' OR ') : DEFAULT_EVENT_FILTER,
            tags: this.tags.join(' AND '),
            begin: options.begin ? options.begin.getTime() / 1000 : undefined,
            end: options.end ? options.end.getTime() / 1000 : undefined,
            ascending: 'yes'
        };

        return this.#fetchAnalytics(mailgunOptions, batchHandler, {
            maxEvents: options.maxEvents
        });
    }
Fetch from the last known timestamp-TRUST_THRESHOLD then work forwards
through pages until we get a blank response. This lets us get events
quicker than the TRUST_THRESHOLD

@param {Function} batchHandler
@param {Object} [options]
@param {Number} [options.maxEvents] Not a strict maximum. We stop fetching after we reached the maximum AND received at least one event after begin (not equal) to prevent deadlocks.
@param {Date} [options.begin]
@param {Date} [options.end]
@param {String[]} [options.events]