feat: allow matching on unions of string literals

[jasonkuhrt]

Enhances Alge.match to be able to work with unions of string literals. Example of what is not possible:

const randomThing = pickRandom(['lego', 'basketball', 'videoGame'])
const sentence = Alge.match(randomThing)
  .lego(() => `Got Lego!`)
  .basketball(() => `Got Basketball`)
  .videoGame(() => `Got video game!`)
  .done()