[FEA] Group profiling tool "Potential Problems"

[revans2]

I ran the profiling tool on some integration test runs as kind of a stress test, and I got some output like.

App Name,App ID,Score,Potential Problems,SQL Dataframe Duration,App Duration,Executor CPU Time Percent
rapids spark plugin integration tests (python),app-20201105103038-0001,68.54,"UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF",2119989,3093153,44.0
rapids spark plugin integration tests (python),app-20210526070813-0008,49.4,"UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF,UDF",1471194,2978171,21.01

This is rather ugly and it might be better to just have UDF and a count of how many times it showed up.