[FEATURE REQUEST]: Call dotnet UDFs directly from Scala or Java code

Let me first say, perhaps this is possible today but I haven't seen any documentation on it. If that is the case, perhaps then just documentation is needed.

**Is your feature request related to a problem? Please describe.**
I'd like to be able to call the our dotnet UDFs directly from Scala or Java code. This is because our UDFs wrap a set of function calls we already have implemented in C# and we'd like to not have to reimplement them in other languages as well. Furthermore, we are also using these UDFs today in production on spark-submit jobs.

**Describe the solution you'd like**
Ability to register my UDFs in Scala code and call them just as regular Scala UDFs.

**Describe alternatives you've considered**
Alternatively, I could reimplement all my UDFs in Scala or PySpark but this is less than ideal due to the amount of code.

**Additional context**
Add any other context or screenshots about the feature request here.