feat(api) add fief auth layer

[prmths128]

First version.

Adds settings and auth layer for fief.
Still a bit experimental, it will have to be challenged once the dust settles but it works.

More than one auth strategies implemented.
It's meant to allow authentication through web page (using cookie), or web app (using token).
The token strategy is also meant as a test for API token auth later (that part could be discussed).

I also added a dependency (not used in this PR) to reconciliate user profiles between fief and the app DB.
Using the dependency in a router ensures the user is authenticated by fief and present in the local DB so we can then check permissions.

[inimaz]

Very good @prmths128 ! Once you feel it's ready maybe you can do a small demo of the authentication flow? Looks very promising!