[FLINK-4504][dataset api]Support user to decide whether the result of an operator is presistent #2675
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This pr is based on #2674 , it add an setOptions() interface to the class Operator, so user can calltext.flatMap().setOptions(ConfigConstants.OPERATOR_RESULT_PERSISTENT_TYPE , "DFS") to specify that the result of flaMap() should be put to DFS.