Integrate L2 cache to ORM

[G-Art]

Implemet integration L2 cache to ORM

1. Build cache regions for queries based on item types or tables used in the query.
2. Calculate unique key for each query(create key generation strategy)
3. Cache query result and store it to the corespondent region with unique key.
4. Create a cache invalidation mechanism to invalidate cache once some item has changed.
5. Implement eviction strategy for cache regions