[chronik-client] Add support for tx finalization/invalidation

Summary: Handle the new enum and the optional finalization reason field from Chronik.

Test Plan:

npm run integration-tests

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D18482