feat: add pick and omit utilities

[ForbesLindesay]

Thanks to @ivawzh for doing most of the work for this one in https://github.com/pelotom/runtypes/pull/161

[see #13]

[rollingversions[bot]]

Change Log for funtypes (1.0.0 → 1.1.0)

New Features

• Added Object.pick and Object.omit

  These mirror the TypeScript types of Pick and Omit. Usage:

  const CrewMember = Object({
  name: String,
  rank: Rank,
  home: Planet,
  });
  const PetMember = CrewMember.pick('name', 'home');
  Static<typeof PetMember> // { name: string; home: Planet; }
  const Background = CrewMember.omit('name');
  Static<typeof Background> // { rank: Rank; home: Planet; }

  P.S. You can supply any number of property names to pick/omit in a single call.

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