T2966

Depends on D13351

Introduce new function + unit tests, getAliasStringsFromValidAliases, which parses all valid alias tx objects stored in the database and returns an array containing only the valid aliases as strings
Introduce a new function + unit tests, getUnprocessedValidAliasRegistrations, which parses unprocessedTxs and and an array of already registerd aliases, and determines which aliases are valid

Review unit test changes and npm test
node index.js
Register some new aliases and send some non-alias txs to the node
When a block is found, confirm that newlyValidAliasTxs match validAliasTxsToBeAddedToDb