fix: UniqueId property support

Author: RandomUser14

Src/Notion.Client/Models/Database/Properties/Property.cs

@@ -25,6 +25,7 @@ namespace Notion.Client
     [JsonSubtypes.KnownSubTypeAttribute(typeof(StatusProperty), PropertyType.Status)]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(TitleProperty), PropertyType.Title)]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(UrlProperty), PropertyType.Url)]
+    [JsonSubtypes.KnownSubTypeAttribute(typeof(UniqueIdProperty), PropertyType.UniqueId)]
     public class Property
     {
         [JsonProperty("id")]

Src/Notion.Client/Models/Database/Properties/PropertyType.cs

@@ -67,6 +67,9 @@ public enum PropertyType
         LastEditedTime,
 
         [EnumMember(Value = "status")]
-        Status
+        Status,
+
+        [EnumMember(Value = "unique_id")]
+        UniqueId,        
     }
 }

Src/Notion.Client/Models/Database/Properties/UniqueIdProperty.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{   
+    public class UniqueIdProperty : Property
+    {
+        public override PropertyType Type => PropertyType.UniqueId;
+
+        [JsonProperty("unique_id")]
+        public Dictionary<string, object> UniqueId { get; set; }
+    }
+}
+

Test/Notion.UnitTests/PropertyTests.cs

@@ -26,6 +26,7 @@ public class PropertyTests
     [InlineData(typeof(SelectProperty), PropertyType.Select)]
     [InlineData(typeof(TitleProperty), PropertyType.Title)]
     [InlineData(typeof(UrlProperty), PropertyType.Url)]
+    [InlineData(typeof(UniqueIdProperty), PropertyType.UniqueId)]
     public void TestPropertyType(Type type, PropertyType expectedPropertyType)
     {
         var typeInstance = (Property)Activator.CreateInstance(type);
@@ -54,6 +55,7 @@ public void TestPropertyType(Type type, PropertyType expectedPropertyType)
     [InlineData(typeof(SelectProperty), "select")]
     [InlineData(typeof(TitleProperty), "title")]
     [InlineData(typeof(UrlProperty), "url")]
+    [InlineData(typeof(UniqueIdProperty), "unique_id")]
     public void TestPropertyTypeText(Type type, string expectedPropertyType)
     {
         var typeInstance = (Property)Activator.CreateInstance(type);