Add 'make-plural/examples'

[eemeli]

Previously, the example numbers for categories that the CLDR provides were only used internally to test the generated functions. With this change, they're incldued in the public API as make-plural/examples:

import { en, fr } from 'make-plural/examples'

fr.cardinal
> {
    one: [ '0', '1', '0.0', '1.0', '1.5' ],
    many: [ '1000000' ],
    other: [
      '2',        '17',
      '100',      '1000',
      '10000',    '100000',
      '2.0',      '3.5',
      '10.0',     '100.0',
      '1000.0',   '10000.0',
      '100000.0', '1000000.0'
    ]
  }