Review discoverability of API inside column selection DSL in IDE

[koperagen]

Just putting it here to not forget to have a look at it using completion. There are new functions, new overloads, plus fixes for ColumnSet based functions

public fun SingleColumn<AnyRow>.nameContains(text: CharSequence): ColumnSet<*> = cols { it.name.contains(text) } public fun <C> ColumnSet<C>.nameContains(text: CharSequence): ColumnSet<C> = cols { it.name.contains(text) }

[Jolanrensen]

depends on https://github.com/Kotlin/dataframe/pull/372