Add support for plural ranges

[eemeli]

This changes the compiler export from:

import Compiler from 'make-plural-compiler'

to:

import { Compiler, compileRange } from 'make-plural-compiler'

where compileRange takes in CLDR-formatted plural range data and returns a function that, when given then start and end plural categories of a range, returns the plural category of the entire range.

In expectation of unicode-org/cldr#797 eventually being merged, the JSON-formatted plural rule data is vendored into the CLI package. The transformed data is published as 'make-plural/ranges'.

[eemeli]

It looks like the CLDR data for ranges is/will be included in its v38 release, but the cldr-core npm package hasn't been updated with that yet.