test: add Iceberg table inspection test for manual exploration

Writes 1K log events to a local Hadoop-catalog Iceberg table at
/tmp/iceberg-inspect so the Parquet data files and Iceberg metadata
can be examined directly on disk.

Author: gsoundar

log4j-iceberg/src/test/java/org/apache/logging/log4j/iceberg/IcebergInspectTest.java

@@ -0,0 +1,51 @@
+/*
+ * 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.logging.log4j.iceberg;
+
+import java.util.concurrent.TimeUnit;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.impl.Log4jLogEvent;
+import org.apache.logging.log4j.message.SimpleMessage;
+import org.junit.jupiter.api.Test;
+
+class IcebergInspectTest {
+
+    @Test
+    void createInspectableTable() {
+        final String warehouse = "/tmp/iceberg-inspect";
+        final IcebergManager manager = new IcebergManager(
+                "inspect", "inspect_catalog", "hadoop", null, warehouse, "logs", "app_logs", 500, 3600);
+        manager.startup();
+
+        final Level[] levels = {Level.TRACE, Level.DEBUG, Level.INFO, Level.WARN, Level.ERROR};
+        for (int i = 0; i < 1000; i++) {
+            final LogEvent event = Log4jLogEvent.newBuilder()
+                    .setLoggerName("com.example.App")
+                    .setLevel(levels[i % levels.length])
+                    .setMessage(new SimpleMessage("log message " + i))
+                    .setThreadName("main")
+                    .setTimeMillis(1700000000000L + i * 1000L)
+                    .build();
+            manager.write(event.toImmutable());
+        }
+
+        manager.stop(10, TimeUnit.SECONDS);
+        System.out.println("Iceberg table written to: " + warehouse + "/logs/app_logs");
+        System.out.println("Inspect with: find " + warehouse + " -type f");
+    }
+}