embed a limited set of icu data small icu

This option makes the resulting binary link against the ICU library statically, and includes a subset of ICU data (typically only the English locale) within the node executable.

Functionalities that only require the ICU library itself, such as [String.prototype.normalize()][] and the [WHATWG URL parser][], are fully supported under small-icu. Features that require ICU locale data in addition, such as [Intl.DateTimeFormat][], generally only work with the English locale:

const january = new Date(9e8);
const english = new Intl.DateTimeFormat('en', { month: 'long' });
const spanish = new Intl.DateTimeFormat('es', { month: 'long' });
console.log(english.format(january));
// Prints "January"
console.log(spanish.format(january));
// Prints "M01" on small-icu
// Should print "enero"

This mode provides a balance between features and binary size.