feat(serialization): add type and assembly allow-list helpers - #10228

src/Orleans.Serialization/TypeSystem/TypeConverter.cs:611

• InspectGenericArguments uses LINQ (GenericTypeArguments.Select(InspectTypeCore)), which allocates an iterator and can add overhead on a hot path (type formatting/parsing). This file had to add using System.Linq; solely for that. Consider replacing this with a simple foreach to avoid allocations and keep the method allocation-free.

    private bool? InspectGenericArguments(Type type)
    {
        foreach (var result in type.GenericTypeArguments.Select(InspectTypeCore))
        {
            if (result != true)

src/Orleans.Serialization/TypeSystem/TypeConverter.cs:399

• IsNamedTypeAllowed returns true for names present in _allowedTypesConfiguration without updating the _allowedTypes cache. For configs which allow types by unqualified name (eg options.AllowedTypes.Add(typeof(Foo).FullName)), this means the same assembly-qualified QualifiedType will miss the cache on every call and still pay the cost of running ITypeNameFilter instances (via InspectTypeNameFilters) each time.

Since InspectTypeNameFilters has already had an opportunity to deny (false) before this branch, it should be safe to cache the allow decision for the current QualifiedType key here as well, improving performance and making caching behavior more consistent.

        if (_allowedTypesConfiguration.Contains(type.Type))
        {
            return true;
        }