Enodo worker client

[timoj]

TLDR;

We need a new client to the worker, which handles the incoming requests, and send result or job requests to the Hub

Description

To accomodate the new worker, we can update the worker client in the lib

Features

• [ ] Worker holds state
• [ ] Worker cleans state of series after N-amount of time
• [ ] Worker can be queried for data
• [ ] On a friendly shutdown the worker should save its state to disk. This will help reduce the amount of siridb queries it has to make on startup