[SPARK-732][SPARK-3628][CORE][RESUBMIT] eliminate duplicate update on accmulator

https://issues.apache.org/jira/browse/SPARK-3628

In current implementation, the accumulator will be updated for every successfully finished task, even the task is from a resubmitted stage, which makes the accumulator counter-intuitive

In this patch, I changed the way for the DAGScheduler to update the accumulator,

DAGScheduler maintains a HashTable, mapping the stage id to the received <accumulator_id , value> pairs. Only when the stage becomes independent, (no job needs it any more), we accumulate the values of the <accumulator_id , value> pairs, when a task finished, we check if the HashTable has contained such stageId, it saves the accumulator_id, value only when the task is the first finished task of a new stage or the stage is running for the first attempt...
can this be put back where it was before? We should try to minimize the surface area of the change.