Verkle integration into distinct trie

[advaita-saha]

This PR integrates the verkle-specific accounts operations in an abstraction similar to distinct_tries which in-turn will be interacting with the state DB, the following are most of the functionality:

1. initiate the Verkle Trie
2. getter and updater functions for accounts and storage from the unified verkle trie (as per EIP-6800)
3. setting the Verkle Trie type in turn would be interacting with core Db for data persistence