[HUDI-4372] Enable matadata table by default for flink

Author: danny0405

hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/configuration/FlinkOptions.java

@@ -103,8 +103,8 @@ private FlinkOptions() {
   public static final ConfigOption<Boolean> METADATA_ENABLED = ConfigOptions
       .key("metadata.enabled")
       .booleanType()
-      .defaultValue(false)
-      .withDescription("Enable the internal metadata table which serves table metadata like level file listings, default false");
+      .defaultValue(true)
+      .withDescription("Enable the internal metadata table which serves table metadata like level file listings, default enabled");
 
   public static final ConfigOption<Integer> METADATA_COMPACTION_DELTA_COMMITS = ConfigOptions
       .key("metadata.compaction.delta_commits")