Load identity informations

src/sakia/app.py

src/sakia/data/processors/certifications.py

src/sakia/data/processors/identities.py

src/sakia/data/repositories/certifications.py

src/sakia/data/repositories/meta.sql

src/sakia/gui/dialogs/connection_cfg/controller.py

src/sakia/gui/dialogs/connection_cfg/model.py

src/sakia/gui/navigation/model.py

src/sakia/tests/unit/data/test_certifications_repo.py

src/sakia/tests/unit/data/test_identies_repo.py