[alias-server] Cache confirmed tx history of registration address

Summary:
T2966

Depends on D13314

Store all tx history of the alias registration address in the database. When a new block is found -- if there are new confirmed txs at the alias registration address that are not in the database, add them.

Test Plan:
Review new mocks and tests
npm test
node index.js and all tx history should be added to db
Send some txs to the alias address
When they are confirmed, logs should confirm they are added to the db

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D13316