Maps a TZID to a PHP timezone.
public
resolve(string $tzid, Component $calendar): ?ResolvedTimezone
the VCALENDAR component containing the TZID (and its VTIMEZONE definitions)
om\ICal\Timezone\VTimezoneResolver::resolve()
om\ICal\Timezone\CompositeTimezoneResolver::resolve()
om\ICal\Timezone\IanaTimezoneResolver::resolve()
om\ICal\Timezone\AliasTimezoneResolver::resolve()
om\ICal\Timezone\FallbackTimezoneResolver::resolve()