Subcommand to recreate state trie from flat db

[garyschulte]

Description

In support of a faster full sync method using deferred state building, besu will benefit from creating a storage subcommand that rebuilds the state trie from flat db. This will aid in testing the state-trie-less full sync method, and bootstrap the code that will be used to rebuild the state trie once the state-trie-less sync method completes.

Acceptance Criteria

• generic functionality to rebuild the state trie from the flat db in a DiffBased world state
• Subcommand to trigger from the CLI the rebuild of the state trie from flat db