MongoDB persistence

[jonyrock]

Hastic has to save it's artifacts to a database. We chose nedb as a small test storage which we can easily add as a requirement to run Hastic. We can't scale this approach much, so we need a "legit" database.

I propose to support all databases which we have in grafana-datasource-kit

Let's start with influxdb

[jonyrock]

Because we use nedb, let's take MongoDB as the first "real database support"

[amper43]

subtasks:

• [ ] add config fields
• [ ] fix data service to work with external data base
• [ ] add migration from NeDB to MongoDB
• [ ] add management of mongodb lifecycle in production mode
• [ ] add mongodb to docker-compose