Describe the feature

We need to implement two functions to persist batches of hashed account and storage leaf nodes into the historical proof storage DB. These are primarily used for saving existing state (backfilling).

Goals:

• Implement store_hashed_accounts
• Implement store_hashed_storages

Acceptance Criteria:

• Both functions insert the correct entries in the MDBX tables.
• Batch insertion is efficient and uses atomic transactions.
• Unit tests

Additional context

No response