include SortableTextField in _default and sample_techproducts configsets

since SortableTextField defaults to docValues="true" it has additional on disk overhead compared to TextField that means I don't think we should completley replace all suggested uses of TextField at this point – but it would still be good to include it in our configsets similar to the way we include declarations for a variety of text analysis options.

I also think several "explicit" fields in the techproducts schema would benefit from using this.