[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-common/src/main/java/org/apache/hudi/common/util/DFSPropertiesConfiguration.java

@@ -60,6 +60,17 @@ public class DFSPropertiesConfiguration {
     visitFile(rootFile);
   }
 
+  public DFSPropertiesConfiguration(FileSystem fs, Path rootFile) {
+    this(fs, rootFile, new TypedProperties());
+  }
+
+  public DFSPropertiesConfiguration() {
+    this.fs = null;
+    this.rootFile = null;
+    this.props = new TypedProperties();
+    this.visitedFiles = new HashSet<>();
+  }
+
   private String[] splitProperty(String line) {
     int ind = line.indexOf('=');
     String k = line.substring(0, ind).trim();
@@ -106,10 +117,6 @@ public class DFSPropertiesConfiguration {
     }
   }
 
-  public DFSPropertiesConfiguration(FileSystem fs, Path rootFile) {
-    this(fs, rootFile, new TypedProperties());
-  }
-
   public TypedProperties getConfig() {
     return props;
   }