[datafusion-spark] Test integrating datafusion-spark code into comet

[alamb]

What is the problem the feature request solves?

• Part of [EPIC] Complete datafusion-spark Spark Compatible Functions datafusion#15914

@shehabgamin added the datafusion-spark crate in apache/datafusion#15168

The goal is to help centralize the development of this function library in the core repository rather than duplicated effort

To verify this is feasible I would like to verify that the setup created in datafusion-spark / apache/datafusion#15168 can be used by downstream crates like comet before we go too far

Describe the potential solution

I would like someone to make a PR that shows we can remove one or more of the spark function in datafusion-spark can be used in comet (and reduce the code here)

Additional context

cc @comphead @andygrove @mbutrovich

[andygrove]

I created apache/datafusion#15947 to add Comet's hex function to datafusion-spark. This involved converting it from a PhysicalExpr to a ScalarUDFImpl.

Also, I created #1711 to use the expm1 function from datafusion-spark in Comet.