[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-kafka-connect/scripts/runKafkaTrafficGenerator.sh

@@ -0,0 +1,38 @@
+# 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.
+
+#!/bin/bash
+
+# First delete the existing topic
+$KAFKA_HOME/bin/kafka-topics.sh --delete --topic hudi-test-topic --bootstrap-server localhost:9092
+
+# Create the topic with 4 partitions
+$KAFKA_HOME/bin/kafka-topics.sh --create --topic hudi-test-topic --partitions 4 --replication-factor 1 --bootstrap-server localhost:9092
+
+# Generate kafka messages from raw records
+inputFile="raw.json"
+# Generate the records with unique keys
+for ((recordKey=0; recordKey<=$1;  ))
+do 
+	while IFS= read line 
+	do
+		echo $line |  jq --argjson recordKey $recordKey -c '.volume = $recordKey' | kcat -P -b localhost:9092 -t hudi-test-topic
+		((recordKey++))
+		if [ $(( $recordKey % 1000 )) -eq 0 ]
+			then sleep 1
+		fi
+	done < "$inputFile"
+done