LibJS: Implement Temporal.ZonedDateTime.compare

Author: https://github.com/Lubrsi
Commit: ac12581140
Pull-request: https://github.com/SerenityOS/serenity/pull/10835
Reviewed-by: https://github.com/IdanHo ✅

Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimeConstructor.h

@@ -25,6 +25,7 @@ private:
     virtual bool has_constructor() const override { return true; }
 
     JS_DECLARE_NATIVE_FUNCTION(from);
+    JS_DECLARE_NATIVE_FUNCTION(compare);
 };
 
 }