[6.x] Number formatter

[jasonvarga]

This PR adds a NumberFormatter that mirrors DateFormatter which can output numbers depending on the user's locale.

import { numberFormatter } from '@statamic/cms/api';

numberFormatter.format(123456789.10);
// en does 123,456,789.10
// de does 123.456.789,10

numberFormatter.formatRange(1234, 5678);
// en does 1,234–5,678
// ja-jp does 1,234～5,678

numberFormatter.formatRange(0.1, 0.2, 'percent');
// en does 10% – 20%
// de does 10–20 %

This PR also makes DateFormatter and NumberFormatter share the same locale. If the NumberFormatter.setDefaultLocale() is used, it'll be reflected in DateFormatter and vice versa.

See this video for an example of how different numbers and dates would be rendered based on the selected locale.

CleanShot.2026-03-26.at.19.58.30.mp4

The only place where this is used at the moment is in pagination: