datastore: domain put, delete, get latest from kvdb

[battlmonstr]

Implementation of DomainPutQuery, DomainDeleteQuery, DomainGetLatestQuery - an equivalent of SharedDomains DomainPut, DomainDel, DomainGet (GetLatest - getLatestFromDb code path). The CAPI execution will be based on the LocalState class which runs these direct datastore queries.

In Erigon DomainPut is based on SharedDomains.domains (Go map) and domainBufferedWriter-s (ETL collector that is eventually flushed into mdbx tables). In Silkworm it is based on RWTxnManaged which will be created from an in-memory mdbx DB shared between Erigon and Silkworm via the CAPI. The mdbx schema is the same as for Erigon3 state mdbx tables. DomainDeleteQuery is just a DomainPutQuery with an empty bytes value.

Refactorings:

• move step.hpp to datastore/common for reuse between snapshots and kvdb
• move codecs to address_codecs, account_codecs, storage_codecs for reuse between domains
• AccountCodec: Account encoding/decoding is extracted from core to a separate class in db/state
  • encode_for_storage_v3 added
  • from_encoded_storage_v3 rewritten to a more direct logic with stricter input checking

Future work:

• LocalState: prev_step, initial_code
• LocalState: deletion
• DomainGetLatest using snapshots