✨ Adds RetrieveAsync to Pages client

Author: asevos

Src/Notion.Client/Api/ApiEndpoints.cs

@@ -24,6 +24,7 @@ public static class BlocksApiUrls
         public static class PagesApiUrls
         {
             public static string Create() => $"/v1/pages";
+            public static string Retrieve(string pageId) => $"/v1/pages/{pageId}";
             public static string UpdateProperties(string pageId) => $"/v1/pages/{pageId}";
         }
     }

Src/Notion.Client/Api/Pages/IPagesClient.cs

@@ -6,6 +6,8 @@ namespace Notion.Client
     public interface IPagesClient
     {
         Task<RetrievedPage> CreateAsync(CreatedPage page);
+        Task<RetrievedPage> RetrieveAsync(string pageId);
+
         Task<RetrievedPage> UpdatePropertiesAsync(
             string pageId,
             IDictionary<string, PropertyValue> updatedProperties

Src/Notion.Client/Api/Pages/PagesClient.cs

@@ -18,6 +18,12 @@ public async Task<RetrievedPage> CreateAsync(CreatedPage page)
             return await _client.PostAsync<RetrievedPage>(PagesApiUrls.Create(), page);
         }
 
+        public async Task<RetrievedPage> RetrieveAsync(string pageId)
+        {
+            var url = PagesApiUrls.Retrieve(pageId);
+            return await _client.GetAsync<RetrievedPage>(url);
+        }
+
         public async Task<RetrievedPage> UpdatePropertiesAsync(
             string pageId,
             IDictionary<string, PropertyValue> updatedProperties)