Getting all the establishments takes too long

[scottcowan]

Page size is fixed to 25 items and the requests take 30 mins to get all the responses.

We could do something around parallel requests to speed this up.

[scottcowan]

This could work although we'd want to limit the number of requests

            var tasks = new List<Task<FindEstablishmentsResponse>>();
            for (var i = 1; i < response.PageCount; i++)
            {
                filter.Page = i;
                tasks.Add(RequestEstablishments(filter));
            }

            Task.WaitAll(tasks.Cast<Task>().ToArray());

            foreach (var task in tasks)
            {
                list.AddRange(task.Result.Establishments);
            }