Major refactor of serialization infrastructure:
- Removed AcSerializeBase; replaced with AcSerializerContextBase<TMetadata> for unified context management.
- Added TypeMetadataWrapper<TMetadata> to combine metadata and per-context tracking state.
- All serializer contexts now inherit from AcSerializerContextBase and use context.GetWrapper(type) for metadata and tracking.
- Reference tracking for IId types is now type-safe and efficient (bitmaps for small int IDs, generic identity maps for others).
- Removed generic ThreadLocal caching from TypeMetadataBase; caching now uses global ConcurrentDictionary.
- Updated all type metadata classes to inherit from non-generic base.
- Added IdPropertyInfo and MetadataType to TypeMetadataBase.
- Added stub context base classes for JSON and Toon.
This centralizes and optimizes metadata/tracking, improves performance, and prepares for future extensibility.
Loretta
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