CDAP-539: Ported DictionaryOpsApp to use Services instead of Procedures.

Initial commit of etl-pack-app migration to services instead of procedures.
if you used something else for the UpperCase version of the key, then the javadoc and the method signature could be simpler...you could use "keyType" instead of "type"

FieldType keyTypeUC = FieldType.valueOf(keyType.toUpperCase());
byte[] val = dictionary.get(dictName, keyTypeUC.toBytes(dictKey), dictField);