[Sprint:37] XD-1791 Add Spark job

 - Add `SparkTasklet` that can run spark application in `client` mode
     - In client mode, the spark job gets executed within container as a job module
 - Add module options to provide
     - master: to point to spark master
     - mainClass: the main class for the spark application
     - appJar: the bundled jar for the application and its dependencies
     - programArgs: the comma separated program arguments for the main class
Could just throw the file strings into an array and then use StringUtils below (instead of the logic for appending with comma separators here).