Number Formatting: add new function to format a number to a short format

[michaelnutt2]

This function is to solve issue #24554 utilizing the Intl.NumberFormat function to shorten long numbers to a specific locale. Similarly to the wp-calypso implementation it will output numbers with 1 decimal if less than 3 digits.

Changes proposed in this Pull Request:

• Adds function to return large numbers formatted as a short string

Does this pull request change what data or activity we track or use?

This is pulling the user locale from getUserLocale, but other than that no.

Testing instructions

• import shortNumberFormat from @automattic/jetpack-components
• Call shortNumberFormat(number) with different WP locales set to get formatted string

I'm new to developing for Jetpack, I'm not sure the best way to test this.

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[dhasilva]

Thinking about this some more, I wonder if a new function is the way to go. Maybe we could expand numberFormat to support an additional, optional, formatting parameter?

It already has an options parameter: https://github.com/Automattic/jetpack/blob/trunk/projects/js-packages/components/components/number-format/index.ts