Add support for range pluralization rules

[tricoder42]

Interesting feature. Plurals have next to ordinal and cardinal also third category: range: http://www.unicode.org/cldr/charts/28/supplemental/language_plural_rules.html

From: formatjs/formatjs#868

[tricoder42]

Question is, how to extend ICU MessageFormat with ranges. MessageFormat allows formatting of single variables in form {argument, formatType, formatArguments}. However, range depends on two arguments.

Two possible variants:

1. {argument1 argument2, range} - Probably breaks a lot of MessageFormat parsers
2. {argument1, range, argument2} - Valid ICU and also it can be read as argument1-argument2

[tricoder42]

Let's do it later™️