LibTimeZone: Begin parsing and generating DaylightSavings rules

Author: https://github.com/trflynn89
Commit: 0e58b04b5c
Pull-request: https://github.com/SerenityOS/serenity/pull/12008
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibTimeZone/TimeZone.cpp

@@ -63,6 +63,9 @@ Optional<StringView> canonicalize_time_zone(StringView time_zone)
     return canonical_time_zone;
 }
 
+Optional<DaylightSavingsRule> __attribute__((weak)) daylight_savings_rule_from_string(StringView) { return {}; }
+StringView __attribute__((weak)) daylight_savings_rule_to_string(DaylightSavingsRule) { return {}; }
+
 Optional<i64> __attribute__((weak)) get_time_zone_offset([[maybe_unused]] TimeZone time_zone, AK::Time)
 {
 #if !ENABLE_TIME_ZONE_DATA