add new struct definitions

Il2CppInspector.Common/Next/BinaryMetadata/Il2CppGuid.cs

@@ -0,0 +1,22 @@
+using VersionedSerialization;
+
+namespace Il2CppInspector.Next.BinaryMetadata;
+
+
+public struct Il2CppGuid : IReadable
+{
+    public Guid Value;
+
+    public void Read<TReader>(ref TReader reader, in StructVersion version = default) where TReader : IReader, allows ref struct
+    {
+        var guid = reader.ReadBytes(16);
+        Value = new Guid(guid, false);
+    }
+
+    public static int Size(in StructVersion version = default, bool is32Bit = false)
+    {
+        return 16;
+    }
+
+    public static implicit operator Guid(Il2CppGuid value) => value.Value;
+}