chore: deprecate ProductListingService and its related factories/interfaces

Author: nozzlegear

ShopifySharp/Factories/ProductListingServiceFactory.cs

@@ -9,8 +9,10 @@
 
 namespace ShopifySharp.Factories;
 
+[Obsolete("Shopify has deprecated the REST API for product listings. This service is deprecated and will be removed in a future version of ShopifySharp. Use ShopifySharp's GraphService to manage product listings via the GraphQL API, and check https://github.com/nozzlegear/shopifysharp for a migration guide.")]
 public interface IProductListingServiceFactory : IServiceFactory<IProductListingService>;
 
+[Obsolete("Shopify has deprecated the REST API for product listings. This service is deprecated and will be removed in a future version of ShopifySharp. Use ShopifySharp's GraphService to manage product listings via the GraphQL API, and check https://github.com/nozzlegear/shopifysharp for a migration guide.")]
 public class ProductListingServiceFactory : IProductListingServiceFactory
 {
     private readonly IShopifyDomainUtility? _shopifyDomainUtility;

ShopifySharp/Services/ProductListing/IProductListingService.cs

@@ -1,10 +1,12 @@
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 using ShopifySharp.Filters;
 using ShopifySharp.Lists;
 
 namespace ShopifySharp;
 
+[Obsolete("Shopify has deprecated the REST API for product listings. This service is deprecated and will be removed in a future version of ShopifySharp. Use ShopifySharp's GraphService to manage product listings via the GraphQL API, and check https://github.com/nozzlegear/shopifysharp for a migration guide.")]
 public interface IProductListingService : IShopifyService
 {
     /// <summary>
@@ -51,4 +53,4 @@ Task<ProductListing> GetAsync(long productId,
     /// <param name="productId">The product object's Id.</param>
     /// <param name="cancellationToken">Cancellation Token</param>
     Task DeleteAsync(long productId, CancellationToken cancellationToken = default);
-}
+}

ShopifySharp/Services/ProductListing/ProductListingService.cs

@@ -1,3 +1,4 @@
+using System;
 using ShopifySharp.Filters;
 using ShopifySharp.Infrastructure;
 using ShopifySharp.Lists;
@@ -12,6 +13,7 @@ namespace ShopifySharp;
 /// <summary>
 /// A service for manipulating Shopify Product which is available to your sales channel
 /// </summary>
+[Obsolete("Shopify has deprecated the REST API for product listings. This service is deprecated and will be removed in a future version of ShopifySharp. Use ShopifySharp's GraphService to manage product listings via the GraphQL API, and check https://github.com/nozzlegear/shopifysharp for a migration guide.")]
 public class ProductListingService: ShopifyService, IProductListingService
 {
     /// <summary>
@@ -65,4 +67,4 @@ public virtual async Task DeleteAsync(long productId, CancellationToken cancella
 
         await ExecuteRequestAsync(req, HttpMethod.Delete, cancellationToken);
     }
-}
+}