[Intl] Extra timezone utilities #11499
Description
follow up of #11447
added Timezones::getCountryCode/forCountryCode in symfony/symfony#31262
added Timezones::getRaw/GmtOffset in symfony/symfony#31295 and symfony/symfony#31318
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follow up of #11447
added Timezones::getCountryCode/forCountryCode in symfony/symfony#31262
added Timezones::getRaw/GmtOffset in symfony/symfony#31295 and symfony/symfony#31318