T2966

Depends on D13360

Add new database collection serverState that currently contains {processedConfirmedTxs: <numberOfProcessedConfirmedTxs}

With this number accurately tracked, it is no longer necessary to store the full tx history in the confirmedTxHistory collection.

A later diff will deprecate the confirmedTxHistory collection, as it would become quite enormous on the IFP address, defeating the point of using the blockchain as the db of record for this service.

Delete all tables related to this app.

mongosh
use ecashAliases
db.validAliasTxs.drop()
db.confirmedTxHistory.drop()

Start up the app
node index.js
App syncs correctly with new processedConfirmedTxs var matching total confirmed txs of test alias address
Register a few new aliases, send some non-alias txs to the test address
confirm processedConfirmedTxs increments appropriately, and the new aliases are picked up
npm test and all pass
npm run live and all pass