Also, removed some old job stuff

Now everything is in Core/Config

I moved HasConfig to Core/Config instead of it being in Database.Prelude

This beefy commit removes the old (unnamed) Servant API.

It forces programmers to think about errors we are logging and reporting
to the frontend, because they need to contain no sensitive data.

Also, some test refactoring and add servant-client to tests.

This is similar to

purescript-gargantext#594

and

!205/

but for JSON import.

This is a first stepping stone in avoiding bugs by having `UserId` and
`ContextId` being proper types, and not synonyms.

We also refactor things to have `AuthenticatedUser` carry the `UserId`.

Basically, Gargantext.Prelude exports all of Protolude now.

This big commit improves the jobs API in a way that now we can
completely abstract away over a JobLog.

Now the job doesn't return 'succeeded' fields when it actually fails.