[Chronik] Add UncompressedPubKey

Summary:
65-byte equivalent of PubKey.

Since uncompressed pubkeys are no longer supported on Bitcoin, we prefix this with Uncompressed-, but leave PubKey as-is (as it's the only usable option).

Test Plan: ninja check-crates

Reviewers: Fabien, #bitcoin_abc

Reviewed By: Fabien, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D13528