T3010

Depends on D13410

Add new endpoint /alias/<alias> that returns {alias: <alias>, address: <address>, isAvailable: bool} for a valid alias string and {"error":"Input must be a valid alias string (a-z, 0-9)"} for an invalid alias string.

node index.js
In a browser, navigate to localhost:5000/alias/ecash and confirm it is registered
Try localhost:5000/alias/_^Sd and confirm error msg
Try localhost:5000/alias/someunregisteredalias and confirm address: false and isAvailable: true