Internalization of OneToOne and ManyToOne Column classes

[Ivanidzo4ka]

machinelearning/src/Microsoft.ML.Data/Transforms/ColumnBindingsBase.cs

Line 17 in 25404b8

public abstract class SourceNameColumnBase

machinelearning/src/Microsoft.ML.Data/Transforms/ColumnBindingsBase.cs

Line 106 in 25404b8

public abstract class OneToOneColumn : SourceNameColumnBase

machinelearning/src/Microsoft.ML.Data/Transforms/ColumnBindingsBase.cs

Line 112 in 25404b8

public abstract class ManyToOneColumn

Should be hidden