LibUnicode: Parse and generate time zone names in long and short form

Author: https://github.com/trflynn89
Commit: b76e44f66f
Pull-request: https://github.com/SerenityOS/serenity/pull/11184

Userland/Libraries/LibUnicode/DateTimeFormat.cpp

@@ -176,4 +176,13 @@ Optional<StringView> get_calendar_day_period_symbol([[maybe_unused]] StringView
 #endif
 }
 
+Optional<StringView> get_time_zone_name([[maybe_unused]] StringView locale, [[maybe_unused]] StringView time_zone, [[maybe_unused]] CalendarPatternStyle style)
+{
+#if ENABLE_UNICODE_DATA
+    return Detail::get_time_zone_name(locale, time_zone, style);
+#else
+    return {};
+#endif
+}
+
 }