ShopifyListFilterOptions does not properly filter to specific order ids.

[nozzlegear]

The ShopifyListFilterOptions class has broken (or been broken). When trying to count or list orders that are filtered to specific ids, ShopifyOrderService will send out a URL that looks like this:

https://my-shop.myshopify.com/admin/orders.json?Ids=System.Collections.Generic.List%601%5BSystem.Int64%5D&status=any&limit=250&page=1&fields=id%2Cnote

There are two problems here:

1. Obviously, the list of ids isn't being serialized.
2. The Ids parameter should be ids.

[nozzlegear]

This bug was also affecting ShopifyProductService.ListAsync and ShopifyProductService.CountAsync. Fixed it by creating and overriding a Parameterizable.ToSingleParameter method for both ShopifyOrderFilterOptions and ShopifyProductFilterOptions that specifically looks for the Ids property and converts it to a querystring value when parameterizing.

I was hoping to instead use the property's Type.IsArray and leave .ToParameters generic without overrides, but Type.IsArray wouldn't reliably work on IEnumerable<T> — only on actual [] arrays.