Remove unused MessagePack runtime resolvers

Assets/Scripts/ServerShared/CultCache/Serialization/RegisterResolver.cs

@@ -1,25 +0,0 @@
-using MessagePack;
-using MessagePack.ReactivePropertyExtension;
-using MessagePack.Resolvers;
-
-public static class RegisterResolver
-{
-    private static bool registered = false;
-    public static void Register()
-    {
-        if (registered) return;
-        
-        // Set extensions to default resolver.
-        var resolver = CompositeResolver.Create(
-            MathResolver.Instance,
-            TypeResolver.Instance,
-            NativeGuidResolver.Instance,
-            StandardResolver.Instance,
-            ReactivePropertyResolver.Instance
-        );
-        var options = MessagePackSerializerOptions.Standard.WithResolver(resolver);
-        MessagePackSerializer.DefaultOptions = options;
-
-        registered = true;
-    }
-}