Add ICANN's reference Latin LGR in RFC 7940 XML format (#2828)

In the next commit I will make changes to this file so it supports just the
basic Latin characters that we want, but it's good to check the base version in
so that we can see diffs.

This was downloaded from https://www.icann.org/sites/default/files/packages/lgr/lgr-second-level-latin-script-25oct24-en.xml

Author: CydeWeys