Add StringEnumConverter

Author: hognevevle

Src/Notion.Client/Api/Search/Parameters/SearchFilter.cs

@@ -1,7 +1,11 @@
-namespace Notion.Client
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace Notion.Client
 {
     public class SearchFilter
     {
+        [JsonConverter(typeof(StringEnumConverter))]
         public SearchObjectType Value { get; set; }
         public string Property => "object";
     }

Src/Notion.Client/Api/Search/Parameters/SearchSort.cs

@@ -1,11 +1,11 @@
-using System;
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
 
 namespace Notion.Client
 {
     public class SearchSort
     {
+        [JsonConverter(typeof(StringEnumConverter))]
         public SearchDirection Direction { get; set; }
 
         public string Timestamp { get; set; }