column-select should enable easier access to column meta data

[genmeblog]

Currently, eg. :type/float64, selects columns with meta tag :datatype with :float64 value.
There can be other meta tags which should be accessible similar way.

select-columns and column-names accept an argument to select meta tag. Other functions do not have this ability.

General way should be implemented:

https://clojurians.zulipchat.com/#narrow/stream/236259-tech.2Eml.2Edataset.2Edev/topic/tablecloth.20column-selector.20as.20in.20TMD