[Chronik] Add BitcoinSer::deser to deserialize messages encoded in the Bitcoin protocol

Summary:
Allows us to deserialize txs, blocks, etc.

Depends on D13947.

Test Plan: ninja check-crates

Reviewers: Fabien, #bitcoin_abc

Reviewed By: Fabien, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D13948