add no-op writer

kafka-connect/kafka-connect/src/main/java/org/apache/iceberg/connect/data/IcebergWriterFactory.java

@@ -56,7 +56,7 @@ public RecordWriter createWriter(
       if (config.autoCreateEnabled()) {
         table = autoCreateTable(tableName, sample);
       } else if (ignoreMissingTable) {
-        return new RecordWriter() {};
+        return new NoOpWriter();
       } else {
         throw nst;
       }

kafka-connect/kafka-connect/src/main/java/org/apache/iceberg/connect/data/NoOpWriter.java

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg.connect.data;
+
+import java.util.List;
+import org.apache.kafka.connect.sink.SinkRecord;
+
+public class NoOpWriter implements RecordWriter {
+  @Override
+  public void write(SinkRecord record) {
+    // NO-OP
+  }
+
+  @Override
+  public List<WriterResult> complete() {
+    // NO-OP
+    return null;
+  }
+
+  @Override
+  public void close() {
+    // NO-OP
+  }
+}

kafka-connect/kafka-connect/src/main/java/org/apache/iceberg/connect/data/RecordWriter.java

@@ -19,16 +19,13 @@
 package org.apache.iceberg.connect.data;
 
 import java.util.List;
-import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
 import org.apache.kafka.connect.sink.SinkRecord;
 
 public interface RecordWriter extends Cloneable {
 
-  default void write(SinkRecord record) {}
+  void write(SinkRecord record);
 
-  default List<WriterResult> complete() {
-    return ImmutableList.of();
-  }
+  List<WriterResult> complete();
 
-  default void close() {}
+  void close();
 }