Publish the "country code -> flag emoji" helper as a separate library

Publish the "country code -> flag emoji" helper as a separate library, currently located at lib/country-flag.js.

Double-check that npm doesn't already have a replacement with a suitably small code side. If there is one, then use it instead.

Quick search yielded two potential libraries:

I like the emoji-flag package. It's minimalistic. emoji-flags has ~40 kB JSON database of countries (which burden to keep up to date).

uriteller used emoji-flags earlier. The size was the reason why I removed it.

emoji-flag depends on punycode2. In our usecase (browser rendering) we can use String.fromCodePoint instead?

In fact it seems that the part of punycode2 that emoji-flag uses does its conversions with String.fromCodePoint.

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