[FEA] UDF Support

[revans2]

Is your feature request related to a problem? Please describe.
It would be great to be able to support scala, java and python UDFs

Describe the solution you'd like
Something that can transpile simple scala, java and python byte code into either cuda kernels or catalyst expressions.

Describe alternatives you've considered
There really are no other options if we want to be fast.

[sameerz]

This is being addressed in other issues.