Support non-latin numeric systems

[cquiroz]

The JVM tends to return the latn system unless specified on the unicode extension:

e.g. bn defaults to the "beng" numeric system on CLDR, however the call

val bn = Locale.forLanguageTag("bn")
DecimalFormatSymbols.getInstance(bn).getNaN()
res13: String = NaN

While the result with pure cldr should be

val bn2 = Locale.forLanguageTag("bn-u-nu-beng")
DecimalFormatSymbols.getInstance(bn2).getNaN()
res12: String = সংখ্যা না