feat: add overload constructor to BatchProduceItem without partition parameter

Author: ffbrunovigidio

src/KafkaFlow/Producers/BatchProduceItem.cs

@@ -14,18 +14,33 @@ public class BatchProduceItem
     /// <param name="messageKey">The message partition key</param>
     /// <param name="messageValue">The message content</param>
     /// <param name="headers">The message headers</param>
-    /// <param name="partition">The partition to produce the message to. If null, the partitioner will be used.</param>
     public BatchProduceItem(
         string topic,
         object messageKey,
         object messageValue,
-        IMessageHeaders headers,
-        int? partition = null)
+        IMessageHeaders headers)
     {
         this.Topic = topic;
         this.MessageKey = messageKey;
         this.MessageValue = messageValue;
         this.Headers = headers;
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="BatchProduceItem"/> class.
+    /// </summary>
+    /// <param name="topic">The destination topic</param>
+    /// <param name="messageKey">The message partition key</param>
+    /// <param name="messageValue">The message content</param>
+    /// <param name="headers">The message headers</param>
+    /// <param name="partition">The partition to produce the message to</param>
+    public BatchProduceItem(
+        string topic,
+        object messageKey,
+        object messageValue,
+        IMessageHeaders headers,
+        int partition) : this(topic, messageKey, messageValue, headers)
+    {
         this.Partition = partition;
     }