[feature] Support Ballista dynamic shuffle partition number

[Ted-Jiang]

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Now ballista only have a fixed partition number ballista.shuffle.partitions After setting this the physical distributed plan will always be set to a fixed partition number.

Doc: link

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restrictions Same values should finally keep on the same partition.

1. Deal with to many partitions:

targetPostShuffleInputSize default with 256MB: each task will read less than this size We combined them to one single read task.

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