Added cloneable interface (#492)

Author: Abigael-JT

src/main/java/com/teragrep/pth10/ast/DPLParserCatalystContext.java

@@ -62,7 +62,7 @@
  * Encapsulates parameters for Catalyst code generator. In addition to that offers access to sparkcontext and incoming
  * datasource
  */
-public class DPLParserCatalystContext {
+public class DPLParserCatalystContext implements Cloneable {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(DPLParserCatalystContext.class);