Add support for link_preview block type

Author: KoditkarVedant

Src/Notion.Client/Models/Blocks/BlockType.cs

@@ -97,6 +97,9 @@ public enum BlockType
         [EnumMember(Value = "table_row")]
         TableRow,
 
+        [EnumMember(Value = "link_preview")]
+        LinkPreview,
+
         [EnumMember(Value = "unsupported")]
         Unsupported
     }

Src/Notion.Client/Models/Blocks/IBlock.cs

@@ -23,6 +23,7 @@ namespace Notion.Client
     [JsonSubtypes.KnownSubType(typeof(HeadingTwoBlock), BlockType.Heading_2)]
     [JsonSubtypes.KnownSubType(typeof(HeadingThreeeBlock), BlockType.Heading_3)]
     [JsonSubtypes.KnownSubType(typeof(ImageBlock), BlockType.Image)]
+    [JsonSubtypes.KnownSubType(typeof(LinkPreviewBlock), BlockType.LinkPreview)]
     [JsonSubtypes.KnownSubType(typeof(LinkToPageBlock), BlockType.LinkToPage)]
     [JsonSubtypes.KnownSubType(typeof(NumberedListItemBlock), BlockType.NumberedListItem)]
     [JsonSubtypes.KnownSubType(typeof(ParagraphBlock), BlockType.Paragraph)]

Src/Notion.Client/Models/Blocks/LinkPreviewBlock.cs

@@ -0,0 +1,16 @@
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{
+    public class LinkPreviewBlock : Block, IColumnChildrenBlock, INonColumnBlock
+    {
+        public override BlockType Type => BlockType.LinkPreview;
+
+        [JsonProperty("link_preview")] public Data LinkPreview { get; set; }
+
+        public class Data
+        {
+            [JsonProperty("url")] public string Url { get; set; }
+        }
+    }
+}