`Record.pick` & `Record.omit`

[samhh]

Struct.omit now behaves more sensibly, however this leaves a space where a Record.omit should be. Record.pick should possibly be included too for symmetry?

omit :: Array string -> Record string a -> Record string a

export const omit = (xs: Array<string>): (<A>(y: Record<string, A>) => Record<string, A>) =>
  R.filterWithIndex(A.elemV(Str.Eq)(xs));