Add identities component

src/sakia/data/connectors/bma.py

src/sakia/data/connectors/node.py

src/sakia/data/processors/blockchain.py

src/sakia/data/processors/identities.py

src/sakia/data/processors/nodes.py

src/sakia/data/repositories/identities.py

src/sakia/gui/navigation/identities/controller.py

src/sakia/gui/navigation/identities/model.py

src/sakia/gui/navigation/identities/table_model.py

src/sakia/gui/navigation/identities/view.py

src/sakia/gui/navigation/model.py

src/sakia/services/blockchain.py

src/sakia/services/identities.py

src/sakia/services/network.py