Moving common code to shared lib

shared/Serializer/JsonSerializer.cs

@@ -0,0 +1,22 @@
+using Confluent.Kafka;
+using System.Text.Json;
+
+namespace Serializers
+{
+    public class JsonSerializer<T> : ISerializer<T>, IDeserializer<T>
+    {
+        public byte[] Serialize(T data, SerializationContext context)
+        {
+            return JsonSerializer.SerializeToUtf8Bytes(data);
+        }
+
+        public T Deserialize(ReadOnlySpan<byte> data, bool isNull, SerializationContext context)
+        {
+            if (!isNull)
+            {
+                return JsonSerializer.Deserialize<T>(data);
+            }
+            throw new Exception ("Data cannot be null");
+        }
+    }
+}