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[SPARK-47563][SQL] Add map normalization on creation
### What changes were proposed in this pull request? Added normalization of map keys when they are put in `ArrayBasedMapBuilder`. ### Why are the changes needed? As map keys need to be unique, we need to add normalization on floating point numbers and prevent the following case when building a map: `Map(0.0, -0.0)`. This further unblocks GROUP BY statement for Map Types as per [this discussion](#45549 (comment)). ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? New UTs in `ArrayBasedMapBuilderSuite` ### Was this patch authored or co-authored using generative AI tooling? No Closes #45721 from stevomitric/stevomitric/fix-map-dup. Authored-by: Stevo Mitric <stevo.mitric@databricks.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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