Core: Fix NPE and deep copy bug in stats - #18060
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This is pulled out of #17433 and fixes two issues:
ContentStatsStruct.copy()threw an NPE when a projected column had no statsFieldStatsStructcopiedStructLikebounds by reference. Bounds are now deep-copied throughStructLikeUtil.copy, andStructCopyis madeSerializableso that a copied bound still survives serialization