Global Merklization Cache

Labels: cache, state-root, performance

Summary:
Introduce a Merklization Cache to support fast state root generation. Cache maintains Merkle node updates for world state and frequently accessed contracts. Cache reads are concurrent; writes and updates are asynchronous.

Subtasks:

• Implement thread-safe Merkle cache engine.
• Integrate with parallel state root calculation.
• Enable LRU-based eviction and async loading fallback.