[datafusion-spark] Optimize hex function
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enhancement
good first issue
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Description
### Is your feature request related to a problem or challenge?
PR https://github.com/apache/datafusion/pull/15947 adds a Spark-compatbile hex function. The feedback on the PR includes some suggested performance optimizations. This issue is for tracking implementing that feedback and adding criterion benchmarks.
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
_No response_
### Additional context
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