Initiate the Identities service

src/sakia/data/connectors/node.py

src/sakia/data/processors/__init__.py

src/sakia/data/processors/certifications.py

src/sakia/data/processors/identities.py

src/sakia/data/processors/nodes.py

src/sakia/data/repositories/identities.py

src/sakia/services/__init__.py

src/sakia/services/identities.py

src/sakia/services/network.py

src/sakia/tests/technical/test_identities_service.py

src/sakia/tests/technical/test_network_service.py

src/sakia/tests/unit/core/test_bma_access.py