fix: make ledger persisted transactions verifiable

[bmuddha]

Currently when a transaction is written to the ledger, it fails to be signature verfied upon replay. This is most likely caused by binary-representation distortion due sequence conversion (txn -> sanitized -> version txn -> protobuf -> versioned txn -> binary bincode). In order to make replication work, we must ensure that any transaction persisted to the ledger can be re-verfied after being read.

Reproduction:

1. Create valid legacy transaction, ensure it can be sig-verified
2. Convert it to sanitized transaction
3. Convert it to version transaction
4. Write it to the ledger
5. Read that transaction from ledger
6. Try to sig-verify, this step should fail.

The work can be based on top of the #1004