Validana Server 2.2.0

• (Minor) Support notifications between server threats using Database.get().notify(mytype, mydata) and ServerEventEmitter.get("notification").subscribe(message,(mydata) => {},mytype)
• (Minor) Allow adding method to retrieve multiple keys from cache at once.
• (Minor) When providing 'wait' for processtx now replies with processed transaction.
• Now defaults to node 16.
• Improve shutdown precedure.
• Now uses @sentry/node instead of raven.