QuantileRegression evaluator exposure

[Ivanidzo4ka]

We have following peace of code:
https://github.com/dotnet/machinelearning/blob/master/src/Microsoft.ML.Data/Evaluators/QuantileRegressionEvaluator.cs

It looks like specific type of evaluation for regression task, but we don't expose it at all.
Shall we do it for v1.0?
@TomFinley @rogancarr

[TomFinley]

No time. No one has asked for it either. On the other hand it was used for a scenario that once upon a time was considered "important," for reasons that escape me (as they come from a time when I joined the team). Hide for now, we can reconsider later?

[TomFinley]

Actaully wait I see it's already internal. What is the question? It looks like it's still accessible via command line, which is fine, do we need to do anything?

[Ivanidzo4ka]

I only ask to determine should it be part of v1.0 or backlog.
Going to backlog.