first commit

Kafka.Lib/Unity/MessageTypeSerializer.cs

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+using System.Text;
+using Confluent.Kafka;
+using Newtonsoft.Json;
+using JsonSerializer = System.Text.Json.JsonSerializer;
+
+namespace Kafka.Lib.Unity;
+
+public class MessageTypeSerializer<T> : ISerializer<T>
+    where T : IMessageType
+{
+    public byte[] Serialize(T data, SerializationContext context)
+    {
+        var returnByte = JsonSerializer.SerializeToUtf8Bytes(data);
+
+        return returnByte;
+    }
+}