Creates metadata for a set-like interface type backed by System.Collections.Generic.HashSet`1 using source-generated resolution for nested elements.
protected static TomlTypeInfo<TEnumerable> CreateSourceGeneratedHashSetBackedEnumerableTypeInfo<TEnumerable, TElement>(TomlSerializerContext context)
where TEnumerable : IEnumerable<TElement>
This method avoids reflection-based metadata resolution, making it compatible with trimming and NativeAOT.