Ported ARFace database

linked to https://gitlab.idiap.ch/bob/bob.paper.frice2/-/issues/1

bob/bio/face/config/database/arface.py

-#!/usr/bin/env python
-
-from bob.bio.base.pipelines.vanilla_biometrics import DatabaseConnector
-from bob.extension import rc
-from bob.bio.face.database import ARFaceBioDatabase
-
-arface_directory = rc["bob.db.arface.directory"]
-
-database = DatabaseConnector(
-    ARFaceBioDatabase(
-        original_directory=arface_directory, original_extension=".png", protocol="all"
-    )
-)