rename RddToDataset file

Author: James Lee

src/main/java/com/sparkTutorial/sparkSql/RddToDataset.java renamed to src/main/java/com/sparkTutorial/sparkSql/RddDatasetConversion.java

@@ -9,7 +9,7 @@
 import org.apache.spark.sql.Encoders;
 import org.apache.spark.sql.SparkSession;
 
-public class RddToDataset {
+public class RddDatasetConversion {
 
     private static final String COMMA_DELIMITER = ",(?=([^\"]*\"[^\"]*\")*[^\"]*$)";