Feature: Support for more database adapters

[hortigado]

Hello, lately I've started to notice a bit of slowness on the part of sqlite, not to mention the headache that migrations generate and the errors that it causes when it is not generated correctly.
A solution to this would be to opt for new databases like objectbox that automatically create the database and would help avoid errors and subtracted code.

The FlutterData package proposes the same scheme and plans to support objectbox.

[tshedor]

What a relief to see a mobile database built with Flutter in mind. The ecosystem has come a long way in four years.

However, as promising as ObjectBox sounds, I have to be honest that I don't have the energy to implement this. I'm no longer working at Dutchie (so this project is purely on personal time), and I'm no longer using Flutter in my day-to-day work (so I'm lagging behind the trends).

Tagging @mateominato or @Doetheman have interest in extending Brick past SQLite. We can leave this issue open for two weeks and see if it attracts any interest from the community. Maybe someone out there wants to add a new provider.