Enable multi-threaded cache

[Eagle941]

After the implementation of parallel block replay, update the cache to make it thread safe. Depending on the type of cache design, it may be more efficient to have multiple caches: some local to the worker/thread and others shared across threads.

• Perform an analysis to understand what data is most likely needed by multiple blocks
• Design the new cache structure for shared data across workers
• Update the existing cache method to make it thread safe