[SPARK-17270][SQL] Move object optimization rules into its own file (branch-2.0) #14843
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What changes were proposed in this pull request?
As part of breaking Optimizer.scala apart, this patch moves various Dataset object optimization rules into a single file. I'm submitting separate pull requests so we can more easily merge this in branch-2.0 to simplify optimizer backports.
This is #14839 but for branch-2.0.
How was this patch tested?
This should be covered by existing tests.