[HUDI-311] : Support for AWS Database Migration Service in DeltaStreamer

- Add a transformer class, that adds `Op` fiels if not found in input frame
 - Add a payload implementation, that issues deletes when Op=D
 - Remove Parquet as a top level source type, consolidate with RowSource
 - Made delta streamer work without a property file, simply using overridden cli options
 - Unit tests for transformer/payload classes

hudi-spark/src/main/java/org/apache/hudi/payload/AWSDmsAvroPayload.java

@@ -0,0 +1,68 @@
+/*
+ * 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.hudi.payload;
+
+import org.apache.hudi.OverwriteWithLatestAvroPayload;
+import org.apache.hudi.common.util.Option;
+
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.avro.generic.IndexedRecord;
+
+import java.io.IOException;
+
+/**
+ * Provides support for seamlessly applying changes captured via Amazon Database Migration Service onto S3.
+ *
+ * Typically, we get the following pattern of full change records corresponding to DML against the
+ * source database
+ *
+ * - Full load records with no `Op` field
+ * - For inserts against the source table, records contain full after image with `Op=I`
+ * - For updates against the source table, records contain full after image with `Op=U`
+ * - For deletes against the source table, records contain full before image with `Op=D`
+ *
+ * This payload implementation will issue matching insert, delete, updates against the hudi dataset
+ *
+ */
+public class AWSDmsAvroPayload extends OverwriteWithLatestAvroPayload {
+
+  public static final String OP_FIELD = "Op";
+
+  public AWSDmsAvroPayload(GenericRecord record, Comparable orderingVal) {
+    super(record, orderingVal);
+  }
+
+  public AWSDmsAvroPayload(Option<GenericRecord> record) {
+    this(record.get(), (record1) -> 0); // natural order
+  }
+
+  @Override
+  public Option<IndexedRecord> combineAndGetUpdateValue(IndexedRecord currentValue, Schema schema)
+      throws IOException {
+    IndexedRecord insertValue = getInsertValue(schema).get();
+    boolean delete = false;
+    if (insertValue instanceof GenericRecord) {
+      GenericRecord record = (GenericRecord) insertValue;
+      delete = record.get(OP_FIELD) != null && record.get(OP_FIELD).toString().equalsIgnoreCase("D");
+    }
+
+    return delete ? Option.empty() : Option.of(insertValue);
+  }
+}