[datafusion-spark] Example of using Spark compatible function library #16384
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Which issue does this PR close?
Rationale for this change
As @shehabgamin and I try and get more use / contributions of the datafusion-spark crate, having it more well documented will make that easier to do
What changes are included in this PR?
datafusion-spark
crate:crypto-expressions
feature needed to compile datafusion-spark outside the workspaceAre these changes tested?
Yes, it includes 2 new doc tests which are run as part of CI
Are there any user-facing changes?