[alias-server] [p14] Write alias data to database

Summary:
T2922

Depends on D13138

Write alias data to database

Test Plan:
Run mongodb with sudo systemctl start mongod
node index.js
Confirm items are added to the database

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D13151