[HUDI-2394] Implement Kafka Sink Protocol for Hudi for Ingesting Immutable Data (#3592)

- Fixing packaging, naming of classes
 - Use of log4j over slf4j for uniformity
- More follow-on fixes
 - Added a version to control/coordinator events.
 - Eliminated the config added to write config
 - Fixed fetching of checkpoints based on table type
 - Clean up of naming, code placement

Co-authored-by: Rajesh Mahindra <rmahindra@Rajeshs-MacBook-Pro.local>
Co-authored-by: Vinoth Chandar <vinoth@apache.org>

hudi-common/src/main/java/org/apache/hudi/common/config/ConfigGroups.java

@@ -30,7 +30,8 @@ public class ConfigGroups {
     FLINK_SQL("Flink Sql Configs"),
     WRITE_CLIENT("Write Client Configs"),
     METRICS("Metrics Configs"),
-    RECORD_PAYLOAD("Record Payload Config");
+    RECORD_PAYLOAD("Record Payload Config"),
+    KAFKA_CONNECT("Kafka Connect Configs");
 
     public final String name;
 
@@ -72,6 +73,9 @@ public class ConfigGroups {
         description = "These set of configs are used to enable monitoring and reporting of key"
             + "Hudi stats and metrics.";
         break;
+      case KAFKA_CONNECT:
+        description = "These set of configs are used for Kakfa Connect Sink Connector for writing Hudi Tables";
+        break;
       default:
         description = "Please fill in the description for Config Group Name: " + names.name;
         break;

hudi-common/src/main/java/org/apache/hudi/common/util/CommitUtils.java

@@ -26,6 +26,7 @@ import org.apache.hudi.common.model.WriteOperationType;
 import org.apache.hudi.common.table.timeline.HoodieActiveTimeline;
 import org.apache.hudi.common.table.timeline.HoodieTimeline;
 import org.apache.hudi.exception.HoodieException;
+
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;