Catalog.NormalizeText doesn't offer a multi-column version

[rauhs]

API: Usually most catalog functions will have an overloaded method to supply multiple columns.

E.g. ctx.Transforms.Text.TokenizeWords(). Though, ctx.Transforms.Text.NormalizeText() only offers single input column to single output column. Was this overlooked or by-design?

[Ivanidzo4ka]

I believe it was just overlooked.
@artidoro any chance you that can be part of your columnOptions PR?

[artidoro]

Yes I can work on that @Ivanidzo4ka!

@rauhs thanks for reporting this. It is actually part of a larger issue that we had in the API. The ColumnOptions was not consistent with other parts of our API, and was immutable, we are moving towards something that looks similar to the Options in the trainers.

The process to get there will be in two steps, the first will hide all the ColumnOptions and keep them internal, the second will make the Options available as a mutable class. This will also allow specifying multi column mappings.

For more info see #2884